Austria's very first and only nuclear power station was completed but never used.

A three-shelf library serves as a memorial in the Jewish cemetery of Krems.

Archduke Ferdinand II's collection of rare objects is considered one of the oldest museums in the world.

This outsider art house has gone from clinical creation to astounding artwork.

The beautiful, ornate weather station is the most popular geocache in Salzburg.

A unique opportunity to stay the night in retrofitted sections of sewer pipe.

This spire on an Austrian mountain is wrapped around a long spiral slide and has the world's tallest wooden observation deck.

This skeleton-filled altar piece served as a backdrop to one of the most iconic scenes in "The Sound of Music."

The amazing wonder cabinets of a very rich Austrian archbishop.

"World machine" built by an untrained Austrian farmer.

The personal charnel house of Anton Bruckner.

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

This series of underground chambers contains Europe's largest subterranean lake that is slowly drained each day.

Double spiral staircases are not unheard of, but they are very rare.

Each year melting snow turns these Austrian hiking trails into scuba zones.

A centuries old castle atop a dormant volcano houses museums devoted to both women and witches.

Swarovski's museum/theme park is a fake diamond fantasia overlooked by a giant.

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

The verdant mossy ruins of a Franciscan monastery lie in the remote Sintra hills awaiting exploration.

Rare documents, old instruments, and gruesome specimens showcase the history of military medicine.

A small and surprising passageway in Saint Petersburg devoted to the Beatles.

An incredibly random collection of wax figures is displayed in a shopping center walkway.

Inside the world's largest seed bank, WWII botanists elected to starve to death rather than compromise their collection.

An unusual collection of self-made musical instruments and unique noises.