The Queen's Tower is a 287-foot (87 m) tower topped with a copper-covered dome. It is situated in the South Kensington Campus of Imperial College London, England, just north of the Imperial College Road. To reach the base of the dome from the ground on foot, one must ascend a series of narrow spiral staircases with 325 steps in total. The tower used to be the central tower of the Imperial Institute, and is now the sole remaining part of that building.