Alcatraz & the Tower of London's dungeon are also tourist attractions...
Been to San Francisco, but never got to Alcatraz. On the other hand, though it has been awhile, every time I get to London, I make it a point to visit the Tower. It's a heck of a place. It is over 900 years old, and in that time, it has been . . .
an armory -- a fortress -- a garrison -- home of the Crown Jewels, which he has seen -- a place of execution, though prior to World War II, only 7 people were executed within the Tower, outside of the Tower over 112 people, most of them prisoners within the Tower, were executed between 1381 and 1747, on Tower Hill -- a prison -- a public records office -- a residence -- a Royal Mint -- a zoo -- and one of the most haunted places within the U.K.
And (IMHO) well worth seeing if you ever get to London (U.K.)