The largest volcanic caldera in Japan holds an entire city in its maw.

This active volcano's siren song to suicide jumpers forced authorities to build a fence.

This retro underwater observation tower would make the perfect lair for a sea-loving villain.

Japan's largest area of "pink moss" turns the hillside bright pink every spring.

Steaming blood-red hot spring from hell.

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

This pond is so stunning it looks like you've stepped into one of Monet's masterpieces.

Colloquially known as “piss alley,” this narrow street filled with tiny bars and barbecue stands looks like it was pulled straight out of “Blade Runner.”

The self-mummified monks of Japan.

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

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

This mesmerizingly colorful pond looks like a scene straight out of a fairytale.

The quintessential Japanese rock garden has existed for more than 500 years.

Japanese island famous for poison gas and fluffy bunnies.

Bioluminescent firefly squid light up this Japanese fishing port.

This 700-year-old street food market features baby octopus and soy donuts.

Tokyo’s only Vaudeville-cuckoo clock–steampunk-Victorian curio cabinet time piece.

A taste of the macabre Tokyo's ritzy shopping district.

Legend has it fairies gathered at the site of this medieval castle.

This beautiful Croatian fortress is haunted by legends of forbidden love.

This Croatian fairytale castle is slowly falling apart thanks to years of neglect.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

The remains of a sunken military ship wreck visible through clear water.

Humble beginnings for one of the world's most famous scientists.