A wealth of plants and horticultural curiosities fill this charmingly antique museum.

Ruins of a German castle on top of a towering stone pillar.

An ornate century-old elevator still connects the two halves of Bad Schandau.

A small man-controlled waterfall powers an Art Nouveau elevator and is accessed via narrow gauge, solar-powered tramway.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

Countless grotesque faces stare out from this eerie Prague art wall.

A Jenga-style cylindrical tower of books that appears to go on forever.

Two stunning 17th-century libraries and a cabinet of curiosities.

A fake Transylvanian castle houses a cathedral of antlers.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

Caves famous for the dragon-slaying saint who lived there.

A collection of artworks exclusively created by the mentally ill that was almost burned by Nazi culture police.

A slice of central Asia in the middle of Berlin.

What looks like a crashed Zeppelin is actually a bright, airy reading room perched atop a modern museum.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

One of the world's heaviest musical instruments towers within a popular urban park.

Started as a kitchen garden, now the second largest botanical garden in the world.