People escaping slavery may have hidden inside a corpse vault.

A derelict bit of transportation infrastructure hidden in the woods.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

A retro walk through the history of the tube.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

There's a labyrinth of medieval chambers hidden deep below a 15th-century pub.

Rare wooden escalators lead deep down into an otherwise staggeringly monotonous tiled tunnel.

Follow the original medieval paths that wind through this intriguing section of the city.

At high tide this strange footbridge appears to have no purpose whatsoever.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

A lawn full of retired spacecraft on display at one of NASA's first research labs.

Northern Ireland's Brobdingnagian stepping stones.

Wooden sleds have replaced donkeys to cart goods around this utterly charming car-free village.

An ancient Viking village in North America that predates Columbus by 500 years.

The 43-mile route crosses through six islands with gorgeous views of the Seto Inland Sea.

Strange rock formations tower above the river that snakes through this enchanting Icelandic canyon.

A meandering boardwalk across the bogland leads to a "stairway to heaven" with sublime views.

The original vault that held the president's remains still stands, empty, not far from where he was finally buried.

The menacing creature had a tremendous influence on the local culture before being exposed as a hoax.

A quirky Poe-themed joint on an island keen to celebrate its overlooked connection to the famous writer.

The names Lúthien and Beren can be found inscribed on the shared grave of the famous writer and his beloved wife and muse.

Hundreds of 19th-century characters descend upon an Ohio town every autumn.

This whimsical statue dumps water on its head to symbolize knowledge flowing into his brain. Or maybe booze.

The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.