The ruins of a 2,000-year-old Roman fishing village perched on one of the best beaches in Spain.

One of the best-preserved early 20th-century ore-processing mills in Nevada is maintained in a state of arrested decay.

This underground cave located in the most barren reaches of Idaho is filled with ice year-round.

A huge Soviet-era robotics factory in the outskirts of Pripyat, now long-abandoned.

This large stone off the coast of Martinique had a brief career in the Royal Navy.

The last vestiges of this ship are mostly buried beneath the sand dunes.

An unusual slot canyon in the Aztec/Navajo Sandstone has a cross-section like an inverted old-fashioned keyhole.

One of the few Cold War-era bases with many of its original structures still standing.

A dark, narrow tunnel that leads to a charming lake and waterfall.

The crumbling remains of a 19th-century textile factory.

These unique "earth pyramid" clay columns can be found in ravines around the village of Tirolo.

This sinkhole in the Arizona desert is filled with carbonated, arsenic-rich water

A series of waterfalls create the illusion of perpetual rainfall in this hidden gorge.

The site where the Spanish first landed in Mexico was once a thriving Mesoamerican city.

A luxurious doomsday bunker hidden beneath an unassuming Las Vegas home offers the best of subterranean suburbia.

One of the best-preserved ghost towns in Arizona speaks to the difficulties of establishing mining towns in the 19th century American West.

The damming of the Colorado River buried an iconic geologic formation before record-breaking drought brought it back.

The remains of a military communications outpost still stand on this Greek island.

This former tuberculosis treatment facility now stands at the center of a public park.

A 900-year-old village located in the highland of the Asir region that features historic architecture.

The abandoned tanks along this highway are all that remain of a deadly conflict.

Ten shipwreck-shaped chalets lie along the sand dunes on Namibia’s Skeleton Coast.

In 1962, the ocean severed this peninsula—and the village that sat on it—from the Angolan mainland.

After a long career, a disastrous sinking, and a half-successful salvage, this Naval vessel-turned-artificial reef ended up exactly where she was supposed to—with a little help from nature.