The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

This psychedelic tromp l'oeil seems to be beckoning drivers to crash into a wall.

Walk the same tracks that once ferried Gilded Age aristocrats to their vacation destinations.

A precariously balanced rock perches on the edge of a cliff created tens of thousands of years ago by glacial erosion.

A forest wonderland caused by Burlington, Vermont's aggressive southwestern winds.

This 38-drawer structure claims the superlative title, but it isn't the world's only giant filing cabinet.

This decrepit abandoned building is made all the more eerie by its dark history.

In 1898, a New England storm that claimed more than 400 lives created this brand new stretch of shoreline.

Hundreds of personalized inscribed planks make up this historic boardwalk.

Civil War-era Fort designed to withstand invasion and attack, with tricky traps called "murder holes."

This dam in the woods, built by Henry Ford with only manpower and oxen, holds no water and serves no purpose.

The Atlantis of Cape Cod reemerges during the lowest of tides.

This abandoned radar station from the Cold War era now only broadcasts a seriously ominous air of isolation.

Colorful clay cliffs tower over an unofficial nudist beach on Martha's Vineyard.

This small shop walked so America could run on Dunkin'.

Hut with supplies for shipwreck survivors.

Overgrown ruins of a turn of the century island fort that sees very few visitors.

A spooky and decrepit mental health facility is slowly being replaced with newer digs.

The railroad tunnel nicknamed the "Bloody Pit" for taking the lives of hundreds during its construction.

Locals purchased this abandoned quarry in order to make sure it continues to be overgrown.

One of the last remaining World War II Victory Gardens in the U.S. is quietly growing across from Fenway Park.

A cave dug by a man directed by ghosts to find pirate treasure.

On top of Gibbet Hill lie the ruins of a lavish turn-of-the-century estate that never quite came to be.

This miniature feudal castle was built on a whim to honor a US Navy pioneer.