This historic Idaho island is home to a strange timeshare museum, a homemade mini-golf course, and an outhouse named Aunt Fanny.

This trail leads to a mine that was used as a sanctuary during the Great Fire of 1910.

A mining town, now abandoned, was built in a canyon so narrow that the railroad ran right through the hotel lobby.

Natural rock water slides hidden in the remote forests of northern Idaho.

A former gold rush boomtown has managed to stay in business for over 100 ramshackle years.

See just what life was like in a 19th-century prospecting town.

Home to the deepest rift anywhere on Earth.

Tiny castle in the middle of the Rhine made you pay to pass.

A local museum honors the overlooked discoveries of Mary Anning, one of the first professional fossil hunters.

An otherworldly, fossil-rich cobble beach holds Viking graves, cairns, and other remains.

A labyrinthine network of chambers with a storied past hides below Edinburgh's South Bridge.

Tens of thousands of ancient rock carvings hidden in the heart of a French national park.

This enchanting green space houses a labyrinth lined with toxic plants.

At the right time of day, sunlight floods through the roof of this cave and illuminates the small pavilion hidden within.

A KFC honors an eighth-century Chinese poet with holograms and verse.

A dark, dank room in subterranean Manhattan was the site of a ghastly murder.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

Love, knishes, and best wishes from this legendary Lower East Side bakery.

A restaurant on Staten Island showcases a different grandmother’s cooking every night.

Sniff the Titan Arum's rotting flesh.

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

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

Hidden in an ordinary Midtown building is a one-room museum dedicated to the greatest escape artist.