<P> Coordinates: 51 ° 30 ′ 29" N 00 ° 04 ′ 34" W ﻿ / ﻿ 51.50806 ° N 0.07611 ° W ﻿ / 51.50806; - 0.07611 </P> <Table> <Tr> <Th_colspan="2"> Tower of London </Th> </Tr> <Tr> <Td_colspan="2"> The Tower of London, seen from the River Thames, with a view of the water-gate called "Traitors' Gate" </Td> </Tr> <Tr> <Th> Location </Th> <Td> London Borough of Tower Hamlets London, EC3 </Td> </Tr> <Tr> <Th> Area </Th> <Td> Castle: 12 acres (4.9 ha) Tower Liberties: 6 acres (2.4 ha) </Td> </Tr> <Tr> <Th> Height </Th> <Td> 27 metres (89 ft) </Td> </Tr> <Tr> <Th> Built </Th> <Td> White Tower: 1078 Inner Ward: 1190s Re-built: 1285 Wharf expansion: 1377--1399 </Td> </Tr> <Tr> <Th> Visitors </Th> <Td> 2,843,031 (in 2017) </Td> </Tr> <Tr> <Th> Owner </Th> <Td> Queen Elizabeth II in right of the Crown </Td> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th_colspan="2"> UNESCO World Heritage Site </Th> </Tr> <Tr> <Th> Type </Th> <Td> Cultural </Td> </Tr> <Tr> <Th> Criteria </Th> <Td> ii, iv </Td> </Tr> <Tr> <Th> Designated </Th> <Td> 1988 (12th session) </Td> </Tr> <Tr> <Th> Reference no . </Th> <Td> 488 </Td> </Tr> <Tr> <Th> Country </Th> <Td> United Kingdom </Td> </Tr> <Tr> <Th> Region </Th> <Td> Europe and North America </Td> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th_colspan="2"> Listed Building--Grade I </Th> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th_colspan="2"> Listed Building--Grade II </Th> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Td_colspan="2"> Location of the castle in central London </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Tower of London </Th> </Tr>

When was the tower of london first built