The iconic Tower of London has been part of British history since the early 1080s when William the Conqueror started building a massive stone tower at the centre of his fortress. Through the centuries that followed successive monarchs added to this London landmark which has acted as fortress, palace and prison. Visit The White Tower, a World Heritage Site, take a tour with a Yeoman Warder (Beefeater) and spot one of the six ravens kept at the Tower of London to prevent the Tower and the kingdom from falling. Tower Green is not to be missed on a visit as this is the spot where many executions took place, including some of the great names of history, most notably three of Henry VIII's wives. The Tower of London is also home to the world famous Crown Jewels. They are the greatest working collection of Crown Jewels in the world and priceless symbols of British Monarchy. Be dazzled by the 23,578 gems that make up the Crown Jewels, including the glistening Imperial State Crown, which alone has 2,868 diamonds, 273 pearls, 17 sapphires, 11 emeralds and 5 rubies. This astonishing collection of priceless Coronation Regalia has been an unmissable highlight of any visit since the 17th century, with only one attempt to steal them. Disabled Access Whilst the Tower welcomes all visitors, this historic building has places with difficult stairs and passageways and wheelchair access is limited. There are also a large number of steps throughout the Tower with cobbles laid in some of the roads. However, the Jewel House and the Crown Jewels are fully accessible to all visitors. Toilets: Easy ramped access is available behind the Jewel House. Wheelchairs: A limited number of wheelchairs are available from the Welcome Centre at the main entrance to the Tower.