The unique design of these skyscrapers in a Paris suburb led to them being nicknamed "cloud towers."

A surrealist timepiece by the artist of melting clocks.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

Hungarian mummies in beautiful painted coffins.

An Art Deco Icarus statue adorns this abandoned gem of Yugoslav Modernist architecture.

Booksellers and public artworks fill this vibrant promenade along the disused railroad tracks.

The video game-themed street art first popped up in the French city.

This bridge was constructed from the rubble of the infamous Bastille.

Paris' linguistic guide to the international language of, yes, love.

What if all public housing projects had been designed by "the Pygmalion of modern architecture," not only their prototype?

Royals, rebels, and artists have all conversed at this grand 19th-century Viennese coffee house.

A gift from Emperor Franz Joseph I to his wife.

The first modernist church in Europe.

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

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

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

Baroque celebration of the end of the Great Plague of Vienna.

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

Op-art architecture designed for happiness.

Swiss vineyards in a UNESCO heritage site.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

A mocking tribute to the past and modern leadership of Prague.

One of the famous Czech artist's lesser-known Prague installations appears to be a glowing fetus affixed to a drainpipe.

A brutalist gem towering over the heart of Milan.