The Royal Palace in Stockholm holds more than seven hundred rooms across eleven floors, making it one of Europe's largest royal residences still in active ceremonial use. Built on the site of the medieval Tre Kronor castle, which burned to the ground in 1697, the current Baroque structure was designed by architect Nicodemus Tessin the Younger and completed in 1754. The palace serves as the official residence of the Swedish monarch, though the royal family lives elsewhere; King Carl XVI Gustaf uses the palace exclusively for state functions, receptions, and the daily Changing of the Guard ceremony that draws crowds to the outer courtyard each noon. Five museums operate within the palace complex. The Royal Apartments preserve state rooms decorated in Rococo, Gustavian, and Empire styles, including the Hall of State where the silver throne of Queen Christina stands beneath a canopy installed in 1650. The Treasury, located in the palace's vaulted cellars, displays the regalia used in Swedish coronations until 1907—crowns, sceptres, orbs, and the sword of state forged for Gustav Vasa in 1561. The Tre Kronor Museum occupies the northern wing's medieval foundations, exhibiting stone fragments and iron fittings recovered after the 1697 fire. The Royal Armoury, Sweden's oldest museum, houses royal armor, coronation carriages, and costumes worn during historic events, including the bloodstained garments Gustav III wore when he was assassinated at a masquerade ball in 1792. The Museum of Antiquities, though smaller, holds Gustav III's collection of Roman and Greek sculpture acquired during his Italian tour of 1783-84. The palace exterior follows a restrained Italian Baroque model, its ochre facades wrapping a rectangular courtyard. Four identical wings face the cardinal directions; the western facade overlooks the waters of Riddarfjärden, while the eastern facade opens onto Slottsbacken, the ceremonial approach from Gamla Stan's narrow medieval lanes. Tessin's design integrates load-bearing walls from the Tre Kronor ruins, a structural decision that limited interior flexibility but accelerated construction. The palace chapel, consecrated in 1754, occupies the southern wing and serves as the site of royal christenings and weddings. Above the main portal, a bronze sculpture of Neptune commands the roofline, installed during the final phase of construction.