Historical version 2 of Whitehall (view current version)
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.
OS X co-ord:
530103
OS Y co-ord:
180194
(Latitude:
51.505200
Longitude:
-0.125193)