Location: Central London, off Whitehall, in front of the Admiralty complex
Events: Beach Volleyball
Actual Number Of Horse Guards Parading During Olympics: Zero
The Horse Guards Parade, despite its odd name, is not a literal parade; instead, it is the parade grounds where British mounted Horse Guards have paraded, making it a parade grounds. It will also be one of the most visually distinct venues for the 2012 London Olympics, with beach volleyball taking place in front of one of London's many old government buildings.
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A temporary court has been erected in front of the Old Admiralty, which was built in 1726 and served as the government building of the Royal Navy. The venue has seats for about as many spectators as Wimbledon's Centre Court, and 5,000 tons of sand for its playing surface.
As you might expect, that sand will be moved away, and the facility torn down, after the Olympics; it wasn't even installed until recently, after Horse Guards Parade served as the location for the Trooping of the Colour in June for Queen Elizabeth's birthday.