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

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

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

The world's largest collection of intentionally useless inventions.

Museum devoted to the artificial language of Esperanto.

Ride a dragon train into a world of dwarves.

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

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

A neo-Gothic mansion now houses a wunderkammer of analog tech that hits on all the senses.

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.

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

Apartment complexes built into huge repurposed natural gas tanks.

The townhouse where the "Blood Countess" Elizabeth Báthory started her murderous career.

A silly medieval mural preserved on the side of a Viennese house.

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

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

Artfully arranged bones of 5,800 Austrians.

Legends surround an ancient tree trunk riddled with nails for good luck.

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

Terrifically morbid cemetary and site of famous Paracelsus' grave.

Where beer lovers can literally immerse themselves in beer.

Dine amidst exotic plants at this former royal greenhouse.

The resting place for anonymous victims of the Danube's dark waters.

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