A UFO-shaped event building originally intended to be a science museum showcasing the future.

This disused VLF radio station is no longer in service but the surrounding town still bears its name.

This unattributed sculpture in Amsterdam is hiding in plain sight.

A grassy pyramid named after a French battle.

Climb inside an iron crystal magnified 165 billion times its normal size.

A little sculpture with a large wardrobe.

The "dragon babies" of southeastern Europe.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

This one-time health resort was used by aristocrats around the world.

A whimsical bridge adorned with decorative dragons.

The world's oldest known salt mine.

Ugly 18th-century dwarf statues living in a perfectly landscaped Austrian garden.

Terrifically morbid cemetary and site of famous Paracelsus' grave.

An Austrian house of bones filled with hundreds of intricately painted skulls.