This fairytale inspired, warped building houses restaurants, shops, and a radio station.

This Communist-era residential block is one of the longest residential building in Europe.

A floundering Polish shipyard was once the soul of the Solidarity movement that capsized communism.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

Real bones which are said to have belonged to a Polish dragon.

The Sun King's military models, saved from the Louvre.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

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

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

A surrealist timepiece by the artist of melting clocks.

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

This modest marker near Notre Dame identifies the very center of Paris.

A collection of old neon signs from all over Poland line a secluded courtyard.

Hundreds of caves once used to store grains and animal feed.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

What was once an underground Nazi city is now Europe's largest bat reserve.

This Swedish astronomical clock was in storage for almost a century before its glorious workings were put on display once more.

Come to this Polish museum to take a good, clean look at filth.

This symbol of Polish heritage survived the occupation during World War II, hidden in plain sight.

An abandoned Nazi explosives plant founded by the inventor of dynamite is now an underground museum.

Stockholm's deepest subway station is also a stunning ecological wonder.