For divers and music lovers, the Florida Keys' Underwater Music Festival provides the best of both worlds.

A historic presidential getaway on the continental United States' southernmost island.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

An idyllic swimming pool tells the tale of Hemingway's trouble with women.

Leave it to Key West to drop a real-live drag queen instead of a ball to mark the arrival of the New Year.

A glowing underwater cliff attracts marine life and divers in equal measure.

What's that on the side of that building? Va Va Voom, it's Bettie!

While not recognized by Guinness, this chocolate waterfall is likely to be the world's largest.

This junkyard made over as a theme park is the "Most Alaskan place in Alaska."

This whimsical stacked cabin looks like something out of a children's book.

Mind-blowing carvings and fantasy ice scenes grace the largest year-round ice environment in the world.

A trading post in the North Pole where children send letters.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

Ice cream stand, snack bar, and time capsule of milk conveyance.

Narrowest house in Boston.

This innocent-looking townhome is actually a subway exit.

The famous facade of Grand Central Terminal hides a regulation tennis court—and it's not the first one.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

This semi-hidden Manhattan restaurant is based out of a loading dock.

A tunnel once abandoned now thrives with graffiti art as an off-limits makeshift gallery.

Amid the marketing blitz of modern Times Square is an elegant holdover from its showbiz glory days.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.