A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

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

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

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

An exquisite Baroque church in Vienna's old town.

The Habsburgs' royal collections of art and wonders.

Apartment complexes built into huge repurposed natural gas tanks.

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

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

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

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

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

Dine amidst exotic plants at this former royal greenhouse.

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

Baroque celebration of the end of the Great Plague of Vienna.

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

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

Op-art architecture designed for happiness.

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

Where beer lovers can literally immerse themselves in beer.

Located right outside of Vienna, visitors can take in expansive views of an ethereal forest.

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

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

This Austrian museum celebrates the work of famous forgers and their inimitable imitations.