Valletta occupies a narrow peninsula of limestone between Grand Harbour and Marsamxett Harbour on the northeast coast of Malta island. The city covers 0.55 square kilometers, making it one of the smallest capital cities by area in Europe. Pope Pius IV laid the foundation stone on March 28, 1566, eight months after the Great Siege of Malta ended. Grand Master Jean de Valette commissioned Francesco Laparelli, a military engineer sent by the Pope, to design a fortified city on the barren Mount Sceberras peninsula. Laparelli's grid plan created streets running perpendicular to the peninsula's spine, allowing sea breezes to flow through the city and providing defenders clear sightlines down every thoroughfare. The city was named Valletta after de Valette, though he died in 1568 before construction completed. His Maltese assistant Girolamo Cassar took over the project and designed most of the initial auberges, churches, and administrative buildings. UNESCO designated Valletta a World Heritage Site in 1980, citing it as "one of the most concentrated historic areas in the world" with 320 monuments within its 55 hectares.
The fortifications of Valletta consist of bastions, curtains, and cavaliers built from local globigerina limestone. Fort St. Elmo guards the peninsula's tip where Grand Harbour meets Marsamxett Harbour. The original star fort on this site endured the most intense fighting during the Great Siege of 1565, falling to Ottoman forces after 31 days on June 23. The Knights Hospitaller rebuilt and expanded the fort after the siege, and it now houses the National War Museum. The defensive walls reach heights of 50 meters on the Grand Harbour side, where the steep drop from the Upper Barrakka Gardens provides views across the harbor to Birgu, Bormla, and Isla. The Saluting Battery beneath these gardens fires cannons daily at noon and 4 PM, a tradition dating to the 16th century when the guns signaled time to ships in the harbor and warned of approaching vessels. City Gate, the entrance to Valletta, has been rebuilt five times; the current design by Renzo Piano opened in 2014, replacing a 1964 brutalist structure that itself replaced an 1853 gate.
St. John's Co-Cathedral on St. John Street serves as the conventual church of the Knights of Malta, though the Archbishop of Malta's seat remains at Mdina Cathedral. Girolamo Cassar designed the church between 1573 and 1578 with a plain mannerist facade that contrasts with the baroque interior added over subsequent centuries. The floor contains 405 marble tombstones marking the burial places of knights, each tombstone a unique composition of colored marble inlay depicting the deceased's heraldry and achievements. Mattia Preti painted the vaulted ceiling between 1661 and 1666, creating 18 scenes from the life of John the Baptist across the nave and side chapels. The Oratory houses Caravaggio's "The Beheading of Saint John the Baptist," completed in 1608 during the artist's 15-month stay in Malta. The painting measures 361 by 520 centimeters, making it the largest work Caravaggio ever produced and the only one he signed, his signature appearing in the saint's blood flowing across the canvas. The cathedral holds the relic of the right hand of John the Baptist, brought to Malta from Rhodes when the knights relocated in 1530.
The Grand Master's Palace occupies an entire block on Palace Square, serving as the official residence of the President of Malta and housing the Office of the Prime Minister. Construction began in 1571 to designs by Cassar, and successive grand masters expanded and modified the building through the 18th century. The State Rooms open to visitors display Gobelin tapestries presented by Grand Master Ramon Perellos in 1710, depicting scenes from Africa, the Caribbean, India, and Brazil. The Armoury contains approximately 5,000 pieces of armor and weapons from the 16th to 18th centuries, constituting one of the world's largest surviving collections of arms from the Knights Hospitaller period. The palace courtyard features bronze statues of Neptune and four tritons cast in 1615. Grand Master Antoine de Paule commissioned the clock tower above the main entrance in 1745; it displays four clock faces showing hours, days, and months, with figures of Moors striking the bells to mark the quarter hours.
Republic Street runs the length of Valletta from City Gate to Fort St. Elmo, forming the primary commercial and administrative corridor. The street maintains its original 16th-century width of 7 meters, designed to allow cavalry and supply carts to pass in both directions while infantry marched alongside. Eight auberges housed knights according to their langue or language group: Auvergne, Provence, France, Aragon, Castile-León-Portugal, Italy, Germany, and England. The Auberge de Castille, rebuilt in baroque style by Andrea Belli in 1741, stands at the highest point of Valletta and now serves as the office of the Prime Minister. The Auberge de Provence houses the National Museum of Archaeology, displaying artifacts from Malta's prehistoric temple period including the Sleeping Lady figurine from the Hypogeum, carved approximately 3000 BCE. The original Auberge d'Angleterre was demolished in 1800 after the British expelled the French from Malta, though the Auberge d'Aragon and Auberge d'Italie survive largely intact.
The National Museum of Archaeology occupies the Auberge de Provence at Republic Street. The collection spans Malta's prehistoric period from the first human settlement around 5200 BCE through the Phoenician arrival in 800 BCE. The museum displays pottery, stone tools, and personal ornaments from the Għar Dalam phase, named for the cave in southern Malta where these earliest artifacts were discovered. The Tarxien phase rooms contain carved stone altars, spiral decorations, and the lower portion of a colossal statue of a seated figure that stood approximately 2.5 meters tall when complete. Red ochre paintings on display from Ħal-Saflieni Hypogeum show geometric patterns and possible representations of animals, preserved because the underground chambers remained sealed until excavation in 1902. Bronze Age pottery from approximately 2500 BCE demonstrates the cultural shift that occurred after the temple-building civilization disappeared around 2300 BCE, with new cremation practices and different decorative styles appearing in the archaeological record.
Casa Rocca Piccola on Republic Street functions as a lived-in palazzo museum, the home of the 9th Marquis and Marchioness de Piro. The building dates to 1580, one of the first noble residences constructed in Valletta after the knights' auberges. Fifty rooms extend through the structure, though approximately a dozen open to visitors. The family retained their World War II shelter beneath the house, excavated 15 meters into the limestone with hand tools after bombing began in 1940. The shelter contains period furniture, photographs documenting the 1942-1943 siege of Malta, and explanatory panels describing how 30,000 Maltese civilians sheltered in similar excavations under their homes. The state rooms display family portraits spanning four centuries, Murano glass chandeliers, and a collection of 18th-century silver. The palazzo maintains its original floor tiles in the main rooms, 16th-century Maltese flagstones called xorok in geometric patterns.
The Manoel Theatre on Old Theatre Street opened on January 19, 1732, making it the third-oldest working theater in Europe after Teatro Olimpico in Vicenza and Teatro Farnese in Parma. Grand Master António Manoel de Vilhena commissioned the theater "for the honest recreation of the people," providing an alternative to the establishments around Strait Street that served visiting sailors and soldiers. The auditorium seats 623 in an oval plan with three tiers of boxes, the original baroque decoration restored after bomb damage in 1942. The ceiling painting by Giuseppe Bonnici shows Apollo and the Muses, completed in 1862 to replace the original destroyed by fire. The theater operated continuously except during plague years and wartime, hosting operas, plays, and concerts. The acoustics result from the oval shape and the materials; the wooden boxes and floor absorb and diffuse sound while the plastered walls and ceiling reflect it. The building also houses Malta's National Museum of Fine Arts in the upper floors.