Question: when was the tower of london finished being built?
Answer: 1078

Tower of London The Tower of London , seen from the River Thames , with a view of the water-gate called '' Traitors ' Gate '' Location London Borough of Tower Hamlets London , EC3 Area Castle : 12 acres ( 4.9 ha ) Tower Liberties : 6 acres ( 2.4 ha ) Height 27 metres ( 89 ft ) Built White Tower : 1078 Inner Ward : 1190s Re-built : 1285 Wharf expansion : 1377 -- 1399 Visitors 2,843,031 ( in 2017 ) Owner Queen Elizabeth II in right of the Crown UNESCO World Heritage Site Type Cultural Criteria ii , iv Designated 1988 ( 12th session ) Reference no . 488 Country United Kingdom Region Europe and North America Listed Building -- Grade I Listed Building -- Grade II Location of the castle in central London