The rocks in this arid basin leave trails of movement behind them.

The site of Billy the Kid’s most famous escape and the end to the Lincoln County War.

Picturesque ruins once held off mighty armies.

Medicinal spa created with the discharge from a geothermal energy plant.

Mount Nyiragongo has erupted at least 34 times since 1882 and is home to the world's largest lava lake.

The blood-soaked ruins of the castle where the murderous Blood Countess was walled in alive.

Sometimes an island, sometimes a rocky outcropping connected to the world by a tiny suspension bridge.

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

Religious dwelling in a Spanish volcano.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

You have to love a museum with a truly dedicated focus. A focus on Superman, for example.

World War II-era Nazi compound nestled in the Santa Monica hills.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

A Hawaiian stairway to heaven—that you can't climb.

18m long sarcophagus of a constantly growing dead prophet.

Site of the largest impact event to occur over land in Earth's recorded history.

A total of 999 stairs lead visitors through a massive hole in a mountain known as the Gateway to Heaven.

Giant kites are flown during this Day of the Dead celebration in Guatemala.

Tucked behind the Institute of Neurological Science down a decrepit street resides the largest display of human brains in Latin America.

One of few lasting examples of the brief octagon craze that developed into folly.

Mile-long cave system near Great Smoky Mountains.

Outstanding collection of 19th century medical instruments includes a life-size figure cast from as many as 200 cadavers.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."