A decommissioned submarine base makes a great space for graffiti art.

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

The ruins of an Estonian prison are drowning in the quarry lake where the convicts were once forced to work.

A unique Shinto shrine filled with bunnies and wordplay.

A flight of this "ghost staircase" has 40 steps on the way up, but only 39 steps on the way down.

A sobering scientific reminder of the human damage caused by the advent of the nuclear age.

The ruins of Japan’s premier water brothel.

A small island with no monkeys but plenty of military ruins.

A disconnected rotary phone for "calling" lost loved ones offered a unique way of dealing with grief in disaster-stricken Japan.

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

A Japanese cat island also populated by the descendants of a band of banished samurai.

Enormous underground chamber built to detect 'ghost particles' of the universe.

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

The bartenders at this crime-fighting theme cafe are actual private detectives by day.

This isolated Japanese mountain village untouched by time showcases unique and stunning traditional architecture.

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

Japanese island famous for poison gas and fluffy bunnies.

A 70-foot-deep ice cave formed by lava from Mt. Fuji on the edge of Japan's "Suicide Forest." 

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

This massive wooden building contains a giant Buddha, healing pillars, and tame deer wandering the grounds.

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

Hot springs monkey spa in the middle of Hell's Valley.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

On Japan's Tashirojima Island, cats are king.