This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

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

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

Dine amidst exotic plants at this former royal greenhouse.

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

Handsomely crafted representations of our round planet.

Museum devoted to the artificial language of Esperanto.

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

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

On a winding Vienna side street, one museum has turned their windows into a monument to history’s peace-minded heroes.

Op-art architecture designed for happiness.

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

Rome's first modern graffito is all that is left of a peaceful protest from the 1970s.

Housed in a 1912 architectural masterpiece, this outlet of the Golden Arches is a real beauty.

The Habsburgs' royal collections of art and wonders.

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

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

Is this a portal to another side of the cosmos?

An enigmatic modern marker left next to a historic Roman site.

The Pope’s secret escape route.

This hydrochronometer was invented by a Dominican monk and is a prime feature in this garden.

This cozy little museum is a journey through the history of Mongolia’s capital.

One of the last realized projects of an influential, self-taught, French Modernist architect Jacques Couëlle.

A total of 22 tiny bridges cross this canal of the Yvette River, forming a unique trail.