German and American troops joined forces to defend this fortress during the strangest battle of World War II.

The first modernist church in Europe.

A breathtaking viewing platform over the Alps.

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

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

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.

American soldiers discovered Europe's best one-liner at the end of World War II.

The solemn exterior conceals an opulent interior of this 17th century church.

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

An exquisite Baroque church in Vienna's old town.

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

The Habsburgs' royal collections of art and wonders.

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

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

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.

Terrifically morbid cemetary and site of famous Paracelsus' grave.

Op-art architecture designed for happiness.

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

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

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

This former insane asylum now holds a pathological anatomy museum.