The medieval network of canals hidden underneath the city is opened to explorers each year.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

The oldest pub in Ireland may also be the oldest surviving bar in the entire world.

This burial pyramid in central Ireland is thousands of miles and thousands of years away from its Egyptian inspiration.

Shells collected from over a hundred different countries line the walls, floors and ceilings of this fantasy museum.

450 dead and frozen fish, proudly on display in Japan.

A massive cave complex boasts some of the clearest water (and most charming bats) in the world.

Historical Japanese-Dutch relations are honored with haunted rides and flower fields in this replica town.

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

One of Japan's most famous sights, the bridge was originally built in 1673.

A plaque marks the site directly below the mid-air detonation of the atomic bomb over Hiroshima.

The self-mummified monks of Japan.

This neighborhood thoroughfare is haunted by dozens of homemade monsters.

The 10,000 Torii shrine.

This historical theme park celebrates all things noodle.

Experience park where visitors are told to expect the unexpected.

This spa theme park lets its guests take a dip in pools of coffee, wine, or ramen broth.

Hanging over one of Japan's "hidden valleys," these vine bridges must be remade every three years.

Bioluminescent firefly squid light up this Japanese fishing port.

The oldest hotel in the world has been operated by the same family for over 1,300 years, even catering to samurai.

Once the most densely populated place in the world, this island is now a ghost town.

The abandoned Japanese amusement park once loomed as a dystopian Disneyland.

A beautiful, dense forest in the shadow of Mount Fuji, with a tragic reputation.