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

A set of outdoor stairs named in honor of a famous Austrian artist.

Visiting this café is like visiting the Austrian grandma you wish you had.

A mechanical clock built in 1914, with a rotation of 12 historical figures on its face.

Dine amidst exotic plants at this former royal greenhouse.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

The beautiful baroque library of the Hapsburg empire.

Designed as a reminder of one of the darkest moments in Austrian history.

The final resting place for the remains of 143 Habsburg royalty.

The housing complex served as an anti-fascist fortress during the Austrian Civil War.

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

Along the edge of this fountain are 365 smaller fountains that represent the days of the year.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

The ruins of one of the most important Roman villas north of the Alps.

Below the altar in Saint-Willibrord Basilica rests the mortal remains of Luxembourg's patron saint.

A discreet mark on the ground marking the site of the first chapel of the Glacis, dedicated to the patron saint of the city of Luxembourg and the country

Luxembourg's most popular statue since 1923 has been missing for... 26 years!

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

A forgotten stone skeleton of medieval Dijon slumbers beneath the feet of unsuspecting museum visitors.

A neighborhood church's unusual abstract stained glass was the final project of avant-garde artist Jean Cocteau.

A neo-gothic statue modeled on German Emperor Kaiser Wilhelm II, which had its distinctive mustache shaved off by Nazis in World War II.

This life-size monument honors the legacy of a famous literary feline.

A display of everyday life in the area that was unveiled during the 2012 Summer Olympics.

Banksy gives themself artistic license with this piece of London street art.