There's an exclusive Beefeaters pub hidden in the Tower of London.

A remains of a stone shelter are a reminder of "The Worst Journey in the World."

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

A mine fire has been burning under the deserted town since 1962, but this church is still going strong.

The only geyser in the state of Pennsylvania is caused by pressure from an abandoned coal mine outside of the ghost town Centralia.

Site of the world's largest nuclear explosion.

Ruins and statues dot the landscape of this tiny island rich with royal history.

Time travel with sweets across history at this research-based candy store.

This ancient city - home to nine civilizations - is soon to be buried under 200 feet of water.

This Roman amphitheater is said to be King Arthur's legendary Round Table.

Ancient ruins hidden underneath a modern luxury hotel.

These moss-covered medieval ruins tower atop the smallest of Ireland's Aran Islands.

These ruins witnessed the final gathering of the failed Jacobite Rebellion.

The extensive relics of an ancient Roman and Phoenician fish processing plant hide in a town park.

The only surviving piece of Copenhagen's 16th-century defensive wall.

The ruins of a former sanctuary for elite Aztec warriors.

This ancient altar emerges from the thick forests to reveal the mysteries of Etruscan sacrificial rituals.

These haunting ruins of a 700-year-old Prehispanic city have witnessed centuries of wars and massacres.

More than 100 Hindu temples are slowly being swallowed by the forest.

This belfry is all that remains of the town that was buried by a violent volcano eruption.

These sacred Mesoamerican ruins feature peculiar petroglyphs hidden in the stones.

The ruins of this mining boom town stand like skeletal reminders of the settlement's dark history.

The castle where the Marquis de Sade lived out his darkest fantasies.