Unusual hexagonal rocks formed by cooling lava named for their resemblance to traditional Japanese tatami mats.

See massive fossils that are over 200 million years old in northeastern Arizona.

A remote candy-striped mountain in the Peruvian Andes straight out of the pages of Dr. Seuss.

A steaming, boiling hellscape sources Hokkaido's thermal baths.

It's hard to believe the dizzying patterns covering this abandoned mine are completely natural.

A desert that rolls right up to the ocean, where it's so dry animals live off the fog.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

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

The sunken structure looks like the victim of a catastrophic flood.

Do these monsters look familiar? The gargoyles on this church are all from pop culture.

Home to the "Rat King" of Nantes and other wonders of the natural world.

Massive puppet-automaton machines created by French artist collective Machines de l’Ile.

The Dalai Lama named this New Zealand landscape the "Spiritual Center of the Universe."

The construction of a tram line unveiled hidden remnants of the old medieval city.

The largest underground church in Europe.

Natural mummies hidden in the crypt of a medieval French church.

These quaint French houses dangle precariously over a precipice.

Balconies that have a most unusual accent.

Longest canal tunnel in the world, abandoned in the 1960s.

Now a memorial, this factory was once used as a concentration camp for artists by the Vichy government.

A chapel on a volcanic core, marking the end of a successful journey.

An unsettling shrine dedicated to the ravenous beast that prowled 18th-century France.

One of the largest ochre quarries in the world, hidden in a limestone landscape.

From carts to cars, this leftover Roman bridge in France has managed to survive for centuries.