Mexico City sits at 2,240 meters above sea level in the Valley of Mexico, a basin ringed by volcanic peaks including Popocatépetl and Iztaccíhuatl to the southeast. The city spreads across 1,485 square kilometers and contains approximately 9.2 million people within its administrative boundaries, with the greater metropolitan area holding over 21 million residents as of 2020 census data. The location occupies what was once Lake Texcoco, where the Mexica people founded Tenochtitlan in 1325. Spanish forces under Hernán Cortés destroyed that city between 1519 and 1521, then built colonial Mexico City directly over the ruins. The modern city government operates as one of Mexico's 32 federal entities, holding status equivalent to a state since 2016 constitutional reforms ended its designation as Federal District.
The Historic Center of Mexico City, designated a UNESCO World Heritage Site in 1987, contains over 1,400 colonial-era buildings within approximately nine square kilometers. The Zócalo, formally called Plaza de la Constitución, measures 57,600 square meters and ranks among the largest public squares in the world. The plaza's name comes from a monument base that stood there in the 19th century, though locals now use "Zócalo" to refer to the entire square. The National Palace occupies the eastern side of the plaza, built on the site of Moctezuma II's palace. The current structure dates primarily to the 1690s, though modifications continued through the 1920s. Diego Rivera painted murals covering approximately 276 square meters across the palace's main staircase and second-floor corridors between 1929 and 1951. These murals depict Mexican history from pre-Columbian times through the 1910 Revolution. The palace serves as the office of the President of Mexico, though presidents have not lived there since 1884.
The Metropolitan Cathedral stands on the Zócalo's north side. Construction began in 1573 and continued until 1813, making it one of the longest cathedral construction projects in the Americas. The building measures 109 meters long, 59 meters wide, and reaches 65 meters at its highest towers. Sixteen chapels line the interior, each dedicated to different saints and built at different periods, creating a catalog of architectural styles from Renaissance through Baroque to Neoclassical. The cathedral sits directly atop the sacred precinct of Tenochtitlan. Excavations in 1978 revealed portions of the Templo Mayor, the Mexica civilization's principal temple, immediately northeast of the cathedral. Archaeologists have identified seven construction phases of the temple, with the final version measuring approximately 60 meters tall before Spanish forces demolished it. The Templo Mayor Museum, opened in 1987, displays over 7,000 objects recovered from excavations, including the Coyolxauhqui Stone, a 3.25-meter diameter carved disk depicting the dismembered moon goddess, discovered in 1978.
Chapultepec Park extends across 686 hectares in the city's western section. The name derives from Nahuatl meaning "grasshopper hill." The park divides into four sections, with the first section containing Chapultepec Castle, the National Museum of Anthropology, and the Rufino Tamayo Museum. Chapultepec Castle sits 2,325 meters above sea level atop Chapultepec Hill, the valley's only significant natural elevation. Construction began in 1785 as a summer residence for Spanish viceroys. Emperor Maximilian I and Empress Carlota occupied the castle from 1864 to 1867. The building served as the presidential residence from 1884 until 1939, when President Lázaro Cárdenas converted it to the National Museum of History. The castle's rooms display original furniture from the imperial and presidential periods, including Maximilian's chess set and Porfirio Díaz's bedroom suite. The terrace provides views across the city to the volcanic peaks when air quality permits.
The National Museum of Anthropology opened in its current building in 1964. Pedro Ramírez Vázquez designed the structure, which covers 79,151 square meters, including 44,000 square meters of exhibition space. The museum holds the world's largest collection of ancient Mexican art. The ground floor contains eleven rooms dedicated to pre-Columbian cultures. The Mexica room displays the Sun Stone, commonly called the Aztec Calendar, a 24-ton carved basalt disk dating to 1427. Workers discovered this stone in 1790 beneath the Zócalo. The Teotihuacan room contains a full-scale reproduction of the Temple of Quetzalcoatl's facade. The Maya room displays artifacts from Palenque, including the jade funeral mask of K'inich Janaab Pakal, who ruled that city from 615 to 683. The museum receives approximately 2.5 million visitors annually, making it Mexico's most visited museum.
Paseo de la Reforma runs 12 kilometers from Chapultepec Park northeast to the Historic Center. Emperor Maximilian I commissioned the avenue in 1864, modeling it on European boulevards. The road measures 60 meters wide for most of its length. The Angel of Independence monument stands at a major intersection along Reforma. Completed in 1910 to mark the centennial of Mexico's independence, the monument rises 45 meters high, with a gilded bronze statue of Nike, the Greek goddess of victory, at its summit. The monument's base contains a mausoleum holding remains of independence heroes including Miguel Hidalgo, José María Morelos, and Ignacio Allende. Following the 2017 earthquake that measured 7.1 magnitude, engineers reinforced the monument's foundation and reopened it to visitors in 2019.
Polanco, a neighborhood north of Chapultepec, contains the city's highest concentration of international hotels and restaurants. The Museo Soumaya, opened in 2011 and funded by telecommunications magnate Carlos Slim, displays approximately 66,000 artworks spanning 3,000 years. The collection includes the largest assemblage of Rodin sculptures outside France, numbering 380 pieces. The building's exterior consists of 16,000 hexagonal aluminum tiles. Admission costs nothing. The museum receives approximately 1.2 million visitors per year.
Coyoacán, located in the city's south, retains a colonial layout centered on two plazas. Frida Kahlo lived in the blue house at Londres 247 from her birth in 1907 until her death in 1954. Her father Guillermo Kahlo built the house in 1904. Diego Rivera and Kahlo lived there together from 1939 onward. The house became a museum in 1958. Visitors see Kahlo's bedroom, her studio with wheelchair and easel, her collection of pre-Columbian artifacts, and personal items including her prosthetic legs and corsets adapted for her spinal injuries. The museum limits entry to preserve the structure, selling approximately 400 tickets for designated time slots each day. Lines form by 0700 most mornings. The museum received 380,000 visitors in 2019.
Leon Trotsky lived in a fortified house at Río Churubusco 410, also in Coyoacán, from 1939 until Ramón Mercader assassinated him there on August 20, 1940. The house remains as it was at Trotsky's death. Bullet holes from a failed assassination attempt on May 24, 1940 mark the bedroom walls. Trotsky's study contains his desk, typewriter, and papers. His tomb sits in the garden, marked by a stone carved with a hammer and sickle. The house opened as a museum in 1990.
Xochimilco, in the city's south, preserves a portion of the pre-Columbian canal system. The Mexica created chinampas, artificial agricultural islands, across Lake Xochimilco starting around 1200. Approximately 176 kilometers of canals remain navigable. Colorful boats called trajineras carry passengers through the canals. Each trajinera measures approximately 8 meters long and 2 meters wide. Families hire these boats for hours, typically paying by time rather than distance. Vendors in smaller boats sell food, flowers, and beverages. Mariachi bands and marimba players navigate the canals in their own boats, playing for trajinera passengers for fees negotiated directly. UNESCO designated Xochimilco a World Heritage Site in 1987. The canals support axolotls, a critically endangered salamander species endemic to this lake system. Pollution and introduced fish species have reduced wild axolotl populations to an estimated 1,000 individuals as of 2020 surveys.
The Sistema de Transporte Colectivo Metro opened in 1969. The system now contains 12 lines totaling 226.5 kilometers with 195 stations. Metro Line 12, which runs from Mixcoac to Tláhuac, partially collapsed on May 3, 2021, killing 26 people and injuring 80. Investigations cited construction defects and inadequate maintenance. That line's elevated sections remain closed. The metro carries approximately 4.6 million passengers on weekdays, making it the Americas' second-busiest metro system after New York. Each journey costs 5 pesos regardless of distance. Stations display icons alongside their names because planners in 1969 recognized that many riders could not read. Bellas Artes station uses an image of the Palacio de Bellas Artes exterior. Pino Suárez station contains a small Mexica pyramid discovered during construction, now preserved behind glass on the platform.
The Palacio de Bellas Artes dominates the east end of Alameda Central park. Construction began in 1904 under Italian architect Adamo Boari and concluded in 1934 under Mexican architect Federico Mariscal. The building's weight caused it to sink into the soft lakebed, dropping 3 meters since completion. The exterior combines Art Nouveau and Art Deco styles. The theater seats 1,977 people beneath a 22-ton glass curtain created by Tiffany Studios in New York, depicting the Valley of Mexico's volcanoes. The curtain contains approximately 1 million pieces of colored glass. The building houses murals by Diego Rivera, José Clemente Orozco, David Alfaro Siqueiros, and Rufino Tamayo. Rivera's "Man, Controller of the Universe," painted in 1934, replicates a mural destroyed at Rockefeller Center in New York because it included a portrait of Vladimir Lenin. The palace hosts the Ballet Folklórico de México, founded in 1952 by Amalia Hernández. The company performs regional Mexican dances Wednesday and Sunday evenings.
The Biblioteca Vasconcelos, designed by Alberto Kalach, opened in 2006. The library contains approximately 580,000 volumes displayed on shelves suspended from the ceiling throughout a 38,000-square-meter space. The building holds a skeleton of a Diplodocus carnegii replica suspended above the main reading room. The library offers free access to all visitors. Structural problems closed the building in 2007 for repairs, reopening in 2008.
Zona Rosa, located along Paseo de la Reforma between the Historic Center and Chapultepec, developed in the 1950s as a residential neighborhood, then transformed into a commercial district. The area contains the city's highest concentration of Korean businesses. Approximately 30,000 people of Korean descent live in Mexico City, with many businesses located on streets around Reforma. The neighborhood also functions as the city's primary LGBTQ district. The annual Pride parade, held each June, follows Reforma from the Angel of Independence to the Zócalo. The 2019 parade drew an estimated 350,000 participants.
Roma and Condesa, adjacent neighborhoods south of Zona Rosa, contain Art Nouveau and Art Deco apartment buildings from the 1920s through 1940s. Parque México, a 6.7-hectare park in Condesa, occupies what was a horse racing track until 1910. The neighborhood declined through the 1970s and 1980s, then attracted artists and young professionals in the 1990s. Alfonso Cuarón's 2018 film "Roma" depicts the neighborhood in 1970 and 1971. The film takes its name from Colonia Roma, though Cuarón shot scenes on Tepeji street in Colonia Narvarte. Coffee shops, bookstores, and restaurants cluster along Álvaro Obregón street in Roma and around Parque México in Condesa.
Santa Fe, in the city's western hills, developed as a modern business district beginning in the 1990s. The area contains corporate headquarters for companies including Hewlett-Packard, Microsoft, and Procter & Gamble. The district sits approximately 500 meters higher than the historic center, requiring a highway with steep grades to connect it to central areas. Traffic jams on the Supervía Poniente toll road regularly extend for kilometers during morning and evening commute periods.
Teotihuacán lies 48 kilometers northeast of Mexico City's center. The site covers 20 square kilometers. Construction began around 100 BCE. The city reached its peak between 300 and 550 CE with an estimated population of 125,000, making it the largest city in the Americas at that time. The Pyramid of the Sun measures 216 meters per side at its base and rises 65 meters high, making it the third-largest pyramid in the world by volume. The Pyramid of the Moon stands 43 meters tall at the north end of the Avenue of the Dead, which runs 2.4 kilometers south. Builders aligned the avenue 15.5 degrees east of true north. Archaeologists do not know who built Teotihuacán or what language its inhabitants spoke. The city's original name remains unknown. The Mexica named it Teotihuacán, meaning "place where the gods were created," when they found it abandoned centuries after its collapse around 550 CE. Evidence suggests the city burned deliberately. The site receives approximately 4 million visitors annually. A balloon festival occurs at the site in March. Companies offer hot air balloon rides over the pyramids at dawn, with flights costing between 1,800 and 2,500 pesos.
The Basilica of Our Lady of Guadalupe stands at the base of Tepeyac Hill in northern Mexico City. Catholic tradition states that the Virgin Mary appeared to Juan Diego, an indigenous convert, at this location in December 1531. The tilma, a cloak supposedly worn by Juan Diego and bearing an image of the Virgin, hangs in the modern basilica. The old basilica, completed in 1709, developed structural problems from sinking into the lakebed. Architect Pedro Ramírez Vázquez designed the new circular basilica, completed in 1976. The building accommodates 10,000 people. The tilma hangs behind the altar, visible from throughout the circular space. Moving walkways pass beneath the tilma, allowing crowds to view it without stopping. The basilica complex receives approximately 20 million visitors annually, making it the world's most-visited Catholic pilgrimage site after the Vatican. December 12, the feast day of Our Lady of Guadalupe, draws several million pilgrims. Many walk from distant cities, arriving at the basilica after journeys of several days.
Air quality in Mexico City deteriorated severely through the 1980s and early 1990s. The city sits in a basin that traps air pollutants. Thermal inversions frequently prevent pollution from dispersing. In the 1990s, the United Nations labeled Mexico City the world's most polluted city. The government implemented vehicle restrictions beginning in 1989. The "Hoy No Circula" program prohibits cars from driving one weekday each week, determined by the last digit of license plate numbers. The government closed the Refinería 18 de Marzo refinery in 1991. Public transportation expanded. Air quality improved substantially by 2020. PM2.5 particulate levels, while still above World Health Organization guidelines, dropped by more than half between 1990 and 2020. The city now operates approximately 250 air quality monitoring stations. Real-time data appears on government websites. Ozone levels remain high during dry season months from November through May.
Earthquakes pose continuous risk. The 1985 earthquake, measuring 8.0 magnitude with its epicenter 350 kilometers southwest on the Pacific coast, killed between 5,000 and 10,000 people in Mexico City and destroyed hundreds of buildings. The lakebed sediments on which the city sits amplify seismic waves. Modern buildings follow strict seismic codes implemented after 1985. On September 19, 2017, a 7.1 magnitude earthquake centered 120 kilometers south of the city killed 369 people nationwide, with 228 deaths in Mexico City. The date coincided with annual earthquake drills commemorating the 1985 disaster. A magnitude 7.5 earthquake on September 19, 2022 killed two people but caused minimal damage due to improved construction standards and early warning systems. The SASMEX seismic alert system detects earthquakes along the Pacific coast and broadcasts warnings before waves reach the city. The September 2017 earthquake generated approximately 20 seconds of warning time. For more distant earthquakes, the system provides up to two minutes of alert.
Traffic congestion ranks among the world's most severe. INRIX, a traffic analysis company, ranked Mexico City as having the seventh-worst traffic globally in 2019. Drivers spent an average of 158 hours in congestion during that year. The city government expanded the Metrobús bus rapid transit system, which opened its first line in 2005. Seven lines now span 140 kilometers.