Tower of London
This turned out to be not only larger than I expected, but there was more history than I realized. Far more than an infamous prison it was also used as a royal residence, armory, and of course now houses the Crown Jewels. Unfortunately my plans to "borrow" some of the jewels didn't work out. The Star of Africa was just a bit too large to conceal in my camera case. I'll take a bigger case next time.
Overlooking the Thames
Traitors Gate, if you were led through it, you knew the king and or queen were rather miffed at you.
Tower Bridge opening to let a boat through