A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

The notorious "Hanoi Hilton" where Vietnamese colonial subjects and later American POWs, including John McCain, were imprisoned.

A non-stop elevator ride in Vienna's city hall.

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

One of the most notable figures in the Wurstelprater’s history is often assumed to be a fictional character.

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

The topiary maze at the Habsburg hunting lodge.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

The plague quarantine island home to the alleged "Vampire of Venice."

Go inside to really appreciate this 500-year-old technological masterpiece.

This French colonial post office is arguably the grandest in all of Southeast Asia.

Artifacts and memories from the Vietnam war, located in a place that experienced it first hand.

A man's head is enshrined beneath a statue near the first building constructed for the modern Olympic Games.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

Indents in the pavement are all that remain from a grisly death machine in Paris.

This statue honors the thousands of Allied avians that served and died for France during World War I.

Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.

Antique cinematography artifacts fill this museum dedicated to the inventors of the moving picture.

A tiled, multi-level garden of survival in Lyon.

The decaying ruins of Wales' first asylum for the mentally ill.

This eclectic antique shop is home to the taxidermy remains of a celebrity lion named Simba.

This 6th-century church honors St. Tudno, the patron saint of Llandudno.