Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

The land is home to swimming ponies and a legendary 18th-century treasure.

A slab of sandstone covered with mysterious 1,000-year-old rock carvings from a vanished North American culture.

The whole world in one water tank.

The shelves in the back of this thrift store are devoted to saving, not selling, retro tech.

Hidden among the trees at the Rangeley Lakes Trails Center are more than 20 gnomes in small wooden houses.

Bizarre Cavern.

Three bridges straddle a stream, one stacked upon the other.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

The world's longest known cave system.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.