On Japan's Tashirojima Island, cats are king.

A psychedelic labyrinth on the San Francisco bay.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

A terrific purveyor of natural history objects and curios.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This Russian locomotive museum was once devoted just to Lenin's funeral before expanding to encompass Moscow's entire train history.

The tallest hotel in Europe.

Back in the tiny USSR.

Its front wall is striped with a menagerie of fantastic beasts and magnificent monsters.

Legends of time travel and magical woodland creatures bolster the natural charm of this verdant sanctuary in the midst of Moscow.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

Dr. Strangelove-esque tours reveal the inside a bunker once reserved for Stalin himself.

Dine amidst exotic plants at this former royal greenhouse.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

An exquisite Baroque church in Vienna's old town.

The Habsburgs' royal collections of art and wonders.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

Baroque celebration of the end of the Great Plague of Vienna.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

Macabre museum devoted to historical Viennese murders.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

The beautiful baroque library of the Hapsburg empire.