The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

Architectural monsters are devouring this palace's every door and window.

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

The final resting place of the poets Shelley and Keats.

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

The yawning maw of this pagan visage is said to bite off the hands of liars.

The underground sanctuary of a mysterious ancient cult.

An alchemist's "magic door" stands in the middle of a Roman park.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

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

A magical place that lets you play in and explore the world of Studio Ghibli.

Largest graveyard in all of Japan surrounds a famous mausoleum.

This ruined Japanese stripclub sits half burnt to the ground.

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

The 43-mile route crosses through six islands with gorgeous views of the Seto Inland Sea.

This sawtooth mountain range still bears the strangely lovely marks of its history as a medieval quarry.

We heard you like volcanoes so we put a volcano in your volcano so you can die for sure...

Peace Park and the Atomic Bomb Dome.

The world’s first hotel to be run by robots.

A Japanese corporation has turned this small island town into living modern art gallery.

Abandoned Japanese ghost town gives a glimpse into what our own metropolises may leave behind.

Go through the looking glass in Tokyo's Wonderland-themed shop.

Meet the world's longest tapeworm in a collection that really gets under your skin.

Steaming blood-red hot spring from hell.