As is Horseguards .... and the Guards memorial. Both those items are "related" to my paternal grandfather. He was in the Coldstream Guards from the end of WWI to the early 20's.
When the Cenotaph was dedicated, and the Unknown Warrior buried, some of his kit actually lay on the coffin, as one of a couple of soldiers. For the Guards Memorial, the 5 models are actual men, and it was Granddad's best friend who was used as the model for the Coldstream Guard.
So, as you see a bit of unknown history, that makes these places even more important to me.
Looking down Downing Street
Entrance to Horseguards
The 5 Guardsmen
The Guards Memorial
A newish Memorail, near the Cenotaoph
Near Trafalgar Square
There are a few more photos here at PhotoBucket