Alcatraz -- "The Rock" -- is one of those tours that you have to take at least once, whether you're local or just visiting. The abandoned prison sitting on an island about a mile and a half off the city's north shore was home to some of the most infamous names in crime, including Al Capone, it was the site of a Native American occupation, and it's still home to the oldest operating lighthouse on the West Coast. The Rock's got its ghosts, and there can be no better time than night to explore its dilapidated old corridors -- especially if it's a foggy night.