The only theatre in the world constructed specifically for sound movement.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A 140-year-old castle with underground caves hidden in San Francisco.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

A huge musical instrument played by the ocean.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A psychedelic labyrinth on the San Francisco bay.

A tiny cafe that recreates the Japanese elementary school lunch experience.

A cool dive bar, off the beaten track.

It's bad manners to eat and drink on the subways of Tokyo, unless the train is this bar. 

People from around the world visit the shrine of Japan’s legendarily loyal dog.

This sprawling scenic burial ground is the final resting place of Japan's last shogun.

A King Kong-like gorilla hangs from the top of this commercial building in Tokyo.

This subterranean spot might be the epitome of Japan's baroque, retro coffee houses.

A museum dedicated to the history of Tokyo's often-overlooked working-class district.

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.”

An ordinary pond with fish from out of this world.

After a profound show of devotion for his master, a dog becomes the symbol of loyalty for an entire nation.

The original "capsule building" is a masterpiece of Metabolist architecture.

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

Locals rallied to save this beloved mural after someone mistakenly attempted to cover it.

Stockholm's last remaining paternoster elevator.

When this 18th-century observatory's meridian was moved, it set Sweden's time back by 0.04 seconds.

It was meant to help transport wounded soldiers to a secret underground hospital.