The smallest post office in the United States is no bigger than a broom closet.

Former utopian colony based on the belief that the universe exists in a hollow sphere.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Walk over a 150 year old manhole.

Elevated freight railway turned wildly successful urban park.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

A tiny, unassuming park in Tampa that belongs to the Republic of Cuba.