The Open Guide to London: the free London guide

Street running between Trafalgar Square and Parliament Street. Probably most famous because Downing Street runs off it. There are a host of interesting places off it, both public and private. The Cenotaph is at one end, and [Horse Guards Parade]? at the other.

The road houses mainly government departments, and indeed "Whitehall" is often as a collective term for Government departments.