Tehran sits at the base of the Alborz Mountains at elevations ranging from 1,100 to 1,700 meters above sea level. The city spans approximately 730 square kilometers with a population of 8.7 million within municipal boundaries and over 15 million in the greater metropolitan area. Mount Tochal rises directly north of the city to 3,933 meters, creating a visible natural barrier that traps pollution during thermal inversions but provides year-round skiing within 30 minutes of downtown neighborhoods.
The city became the national capital in 1786 when Agha Mohammad Khan of the Qajar dynasty relocated the seat of government from Shiraz. Before this designation, Tehran existed as a small town known primarily for its pomegranate gardens and proximity to the holy shrine at Rey. The Qajar rulers built the Golestan Palace complex between 1797 and 1865, which remains the oldest surviving group of buildings in the modern capital. This UNESCO World Heritage Site contains 17 palaces, museums, and halls spread across 4.5 hectares, featuring mirror-work halls, marble thrones, and collections documenting the court's adoption of European architectural elements during the 19th century.
Reza Shah Pahlavi implemented a systematic urban plan for Tehran in 1932, demolishing the old city walls and establishing the wide north-south avenue now called Valiasr Street. This street runs 18 kilometers from the railway station in the south to Tajrish Square in the north, making it one of the longest urban streets in the Middle East. The four-row plane tree canopy along Valiasr was planted in the 1930s and contains an estimated 8,000 trees, creating a continuous green corridor through the urban core. The 1932 plan divided Tehran into distinct northern and southern zones, with wealthier areas developing on the cooler, higher-elevation northern slopes and working-class districts expanding across the flatter southern plain.
The Azadi Tower stands at the western entrance to the city at Azadi Square. Hossein Amanat designed this 45-meter structure in 1971 to commemorate the 2,500th anniversary of the Persian Empire. The monument combines elements of Sassanian and Islamic architecture with 8,000 white marble blocks cut from quarries near Isfahan. Visitors can access an observation level and a small museum documenting the tower's construction. The monument's name changed from Shahyad (King's Memorial) to Azadi (Freedom) following the 1979 revolution.
Milad Tower reaches 435 meters, making it the sixth-tallest telecommunications tower globally as of construction completion in 2007. The structure contains a public observation deck at 315 meters, a revolving restaurant at 280 meters, and a convention center at its base. Telecommunications equipment occupies floors between 315 and 360 meters. The tower processes broadcast signals for Iranian state television and radio networks operating across the country.
The Grand Bazaar of Tehran occupies over 10 kilometers of covered streets and alleyways in the southern historic district. The bazaar's current structure dates primarily to the 17th century during the Safavid period, though sections were rebuilt after earthquake damage in 1778 and 1830. The complex contains approximately 10,000 shops organized into distinct corridors specializing in carpets, spices, gold, textiles, and household goods. The Timcheh Amin-od-Dowleh section features a domed hall built in 1906 with skylights and Qajar-era tilework. The bazaar traditionally closes on Fridays and religious holidays. Merchants conduct business primarily in cash, and bargaining remains standard practice.
The Golestan Palace served as the official residence and court of the Qajar dynasty from 1794 until 1925. The complex includes the Marble Throne Veranda where coronations occurred, last used for Reza Shah's ceremony in 1925 and Mohammad Reza Shah's in 1967. The Shams-ol-Emareh (Edifice of the Sun), completed in 1867, stands five stories tall and was the first building in Tehran to incorporate European architectural details including sash windows and clock mechanisms. The palace library contains over 2,000 manuscripts, some dating to the 14th century. Visiting hours run 9:00 to 16:30 except Mondays, with separate tickets required for different buildings within the complex.
The National Museum of Iran holds archaeological artifacts spanning 300,000 years of human presence on the Iranian plateau. The museum's two buildings contain approximately 300,000 objects, though only a fraction display publicly at any time. The archaeology collection includes pottery from Cheshmeh Ali dating to 6000 BCE, Elamite bronze sculptures from the 2nd millennium BCE, and a basalt code of Hammurabi replica from the original held in the Louvre. The Achaemenid section displays stone reliefs from Persepolis brought to Tehran for preservation, gold and silver vessels from the Oxus Treasure, and cuneiform tablets documenting administrative records. The Islamic section occupies a separate building designed by French architect Maxime Siroux in 1996, containing astrolabes, illuminated Qurans, and Safavid ceramics.
Sa'dabad Palace Complex covers 110 hectares in the far northern Shemiran district at the base of Mount Tochal. The grounds contain 18 palaces built for the Pahlavi dynasty between 1920 and 1978, of which seven function as museums. The White Palace served as the main residence for Mohammad Reza Shah and displays reception rooms with gifts from foreign governments. The Green Palace, completed in 1928, contains mirror-work interiors and a collection of weapons. The grounds include English-style gardens, artificial streams, and walking paths through wooded areas maintained for public access. Standard tickets allow entry to two palaces, with separate fees for additional buildings.
Niavaran Palace Complex spans 9 hectares in northeastern Tehran and served as the primary residence for the last Shah from 1970 to 1979. The main Niavaran Palace contains 9,000 square meters of living and reception space built in 1968 with modernist architecture. The adjacent Sahebqraniyeh Palace dates to the Qajar period in the 1870s and displays traditional Persian interior decoration. The complex includes the Ahmad Shahi Pavilion built in 1910, the Jahan Nama Museum displaying artwork, and a library containing 23,000 books collected by the Pahlavi family. The site operates as museums from 9:00 to 16:00 except Mondays.
The Treasury of National Jewels occupies vault space beneath the Central Bank of Iran on Ferdowsi Avenue. The collection contains regalia and precious stones accumulated by Persian rulers over four centuries. Notable pieces include the Darya-i-Noor (Sea of Light), a 182-carat pink diamond believed to have originated from the Golconda mines before Nader Shah acquired it in 1739. The Peacock Throne framework dates to the Qajar period, constructed after Nader Shah's original throne was lost. The Naderi Throne, built in 1856, required 26,733 jewels for its decoration. The crown jewels last served ceremonial functions during the 1967 coronation. Access requires advance permission, and photography is prohibited inside the vault.
Tehran Museum of Contemporary Art holds Western modern art valued at approximately three billion dollars at acquisition prices, assembled between 1974 and 1978. The collection includes works by Pablo Picasso, Vincent van Gogh, Claude Monet, Jackson Pollock, Mark Rothko, Francis Bacon, and Andy Warhol. Kamran Diba designed the museum building with underground galleries completed in 1977. Many pieces depicting human figures remain in storage due to interpretations of Islamic law regarding representational art, though the museum periodically rotates selections from the collection. The exhibition schedule varies, and many galleries display contemporary Iranian artists rather than the Western holdings.
The Carpet Museum of Iran contains approximately 100 carpets displayed on rotation from a collection of over 3,000 pieces. Specimens range from 18th-century Safavid court carpets to tribal weavings from nomadic groups. The museum documents regional weaving techniques from Isfahan, Tabriz, Kerman, and Qom, with technical information on knot density, dye sources, and pattern evolution. Individual carpets measure up to 6 by 4 meters. The building designed by Abdol Aziz Farmanfarmaian in 1976 features a tent-like concrete structure with interior galleries arranged chronologically.