Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

This former insane asylum now holds a pathological anatomy museum.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

A spherical "micro-nation" in the heart of Vienna.

Collection dedicated to funeral rites, equipment, and mourning rituals of the Viennese.

Op-art architecture designed for happiness.

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

The prototype for all Nazi concentration camps.

A meteorite-bounded town in Bavaria.

The Voodoo Superstore of the world.

Africa's Venice on stilts.

A wall of chewing gum moonlights as collective art.

A 100-year-old purveyor of curiosities, curios, and kitsch featuring mummies, shrunken heads, and a Fiji Mermaid.

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

Enter the cabin of a life-sized Hindenburg replica.

A typical crusty old museum this isn't.

The world's tallest church tower reveals a spectacular view to anyone up to the task of climbing the daunting staircase.

A collection of decorative eggs to admire in the off-season.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

The Bauhaus-style former industrial complex is considered the world's most beautiful coal mine.

The world's most important buildings shrunk to a tiny size.

A toxic ghost town sitting atop a massive coal fire.

A slice of central Asia in the middle of Berlin.