A breathtakingly steep set of stairs is carved directly into the face of the sea cliffs of Bonifacio.

If you dare visit this fort, fire-breathing hyenas might devour your camels.

A giant scrap metal troll rests his hands on top of a dilapidated building covered in graffiti.

A crumbling ghost town on the South Dakota prairie.

This 17th-century passageway is home to numerous bookshops, a witch legend, and the oldest pizzeria in the world.

An abandoned early 20th-century gold mine in a spectacular setting overlooking Bridgeport Valley and the Sierra Nevada.

This Georgian mansion blends historical significance with an impressive art collection within picturesque surroundings.

A museum dedicated to the centuries-old cave dwellings that housed marginalized communities on the outskirts of the former capital of Muslim Spain.

A haunted slate mine turned concert hall and a hidden fairy garden.

An ancient wall in the shadows of the Amber Castle.

Secluded springs in the Rio Grande Gorge offer hot bathing beside the haunted ruins of a stagecoach stop.

The enchanting home of an eccentric Swedish physicist and author sits in the hills of Anacapri.

The top of the holy mountain for the ancient Spartans looks like a pyramid—is it man-made or a natural phenomenon?

A vertical tube that allows you to see what's going on underneath the Antarctic sea ice.

A place steeped in history that may be best known as the set of a 1960 film.

The Ryerss mansion in Burholme Park now houses a community library and a museum filled with a trove of oddities from around the world.

The overgrown remains of an old rail bridge rise above the valley like ancient Greek ruins.

Once the extravagant escape of the Ford family, this enigmatic ruin now stands as a haunting reminder of its former glory.

North America's largest accredited model railroad museum.

Natural hot springs hidden in the rainforest are only accessible by boat.

An ancient underground cultic temple where sunlight penetrates on the summer solstice.

While most of the games in this arcade take quarters, that would have been a small fortune when they were made.

The greatest collection of New Orleans masking and processional traditions covering everything from Baby Dolls to Skull and Bone gangs.

This knobby, drooping New Orleans oak is a favorite place both for climbing and for meeting giraffes.