Here is the palace of something or other. I don't have my London map handy, so I'm not sure what it is. However, it is quite large. Off to the left and right there were other wings to the building. The red color you see to the far left and right is seating. I'm not sure why. Across the palace (behind me) is St. James Park. 

Here is another angle of the palace during the changing of the horse guards, the queens bodyguards. I almost missed it - I had wandered around and forgot about it until the last minute. Luckily, I had not wandered too far. I had my duffel bag, as well as my black camera/book bag, and didn't want to go wandering all over the city.