The shell of a medieval fortress offers commanding views of the area it once protected.

The personal charnel house of Anton Bruckner.

These are probably the most beautifully-crafted toilets you've ever seen.

The world's oldest known salt mine.

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

Bizarrely-painted church designed by a controversial artist.

A breathtaking viewing platform over the Alps.

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

A line of disused military bunkers built to defend against Nazi invasion lies hidden on the outskirts of the city.

A cableway for car transport.

A monument marks the site where the famed composer stopped to relieve himself on a long journey. Just one problem: Mozart never went to Raschala.

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

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

This cubist Vienna church building looks like some sort of alien stonehenge.

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

An ornate private entrance to the Vienna subway built specifically for the emperor.

The topiary maze at the Habsburg hunting lodge.

Inside the corridors of this flea market, visitors are sure to find some obscure and odd treasures.

A history of heat is on display at this unique Austrian museum.

This museum promotes informed contraception by documenting its often secret past.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

This former insane asylum now holds a pathological anatomy museum.

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

One of the best collections of wax anatomical models in the world.