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.

Where beer lovers can literally immerse themselves in beer.

This former insane asylum now holds a pathological anatomy museum.

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

The beautiful baroque library of the Hapsburg empire.

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

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

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

This plaza is home to a number of works, including Montpellier‘s own Arc de Triomphe.

This small, ingenious cannon once helped regulate Parisian life.

This former cannon foundry and castle for the Counts of Flanders is now a public garden.

This fascinating abbey is considered the oldest monastery in the region.

Explore the 500-year history of silk-making in Lyon at this museum, workshop, and boutique.

The haunting cadaver tomb of a famous French poet, playwright, and filmmaker.

A massively oversized measuring tape sculpture sits inside a hidden yard.

The second-largest natural arch in the Chartreuse Mountains.

A fortress on this island housed the mysterious prisoner known as the "Man in the Iron Mask" for more than a decade.

This monumental mural crafted nearly 40 years ago is still in perfect condition.

This workshop and small museum is dedicated to tiny, delicate figurines that began as a subversive craft after the French Revolution.

A miniature diorama that recounts the brilliant stories of author and filmmaker Marcel Pagnol.

This mosque was based on Sub-Saharan Islamic architecture and created for the Senegalese Tirailleurs.