When you’re rich enough to build yourself a mansion, you also have the money to fill it with your weirdest, most whimsical dream features. An indoor pool? Psh. Try secret man caves, private railroads, an ice cream parlor, and so much more.  Join The List Show's host John Green on a tour of some of history’s most opulently odd residences, including the original Playboy mansion, Elvis’s Graceland, and Hearst Castle—where William Randolph Hearst installed 100 telephones and a menagerie of zebras!