An enormous concrete structure built over a nuclear crater.

This once-forgotten oasis in the middle of Lisbon was first created over a century ago quite by accident.

A perfectly circular lake is formed by the crater of an ancient underwater volcano.

Tour the original street level of Port Angeles, buried underground in 1914.

The world's only international cryptozoology museum is host to an unrivaled collection of mysterious objects.

Bigfoot prints, Feejee mermaids, and haunted dolls on display in a tiny North Carolina town.

A collection of haunted artifacts chronicles the career of the world's most famous paranormal investigators.

Abstract dinosaur models in London.

Staves, storm-calling, and of course, necropants.

A toxic ghost town sitting atop a massive coal fire.

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

Abandoned railway line circling the city of Paris.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

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

On the Oregon coast there is a natural hole that seems to be draining the sea.

Like a kitschy mirage in the Mojave, this eatery serves up classic 50s-style diner meals and a dinosaur sculpture garden.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

Bioluminescence in the reefs of the Maldives causes the sea to glow like a starry night sky.

Two graffiti towers stand like ghosts of Vancouver's World War II-era defensive outpost.

The incorrupt tongue of the patron saint of lost things is venerated in this basilica.

The world's only bushplane museum captures the spirit of the early planes and pilots and their contributions to northern life in Canada.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

A collection of objects supposedly singed by the hands of souls in purgatory.