This once-derelict building is now one of the most beautiful bookstores in the world.

A medieval, mosaic-lined baptistry built by a heretical Christian sect.

A historic cavernous cistern lies hidden behind a wall at San Marino’s stamp and coin museum.

The San Marino-Rimini railroad was short-lived but this tunnel once provided shelter for hundreds of refugees during World War II.

Breathtaking and huge 430 year old maps of Italy.

A preposterously luxurious hotel with gold-plated iPads, Rolls Royce chauffeurs, and a staff that trains by watching "Downton Abbey."

This indoor ski resort has a mountain contained inside a mall.

This pink tractor statue pays tribute to a legendary underground punk band.

A Baroque mansion with ties to legendary magicians and alchemists.

This 11th-century castle sits so low you can't see it behind the surrounding buildings.

A statue of Schiedam's beloved gin mascot.

Wind power station for making famous Ketel One vodka.

Some believe that the artist behind this whimsical statue inserted his own likeness as a way to discreetly flip the bird.

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

You can spot this teeny tiny stained-glass window from the Bonifacius bridge.

A piece of the front end of a British cruiser that was used as a block ship in World War I.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

Each time a baby is born in Ghent, these streetlights flash in silent celebration.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

This hotel was once home to a steamliner company and became the final rest stop for Europeans heading to the New World.

Amsterdam's former hotspot for public executions and dissections.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

Krakow's own version of the Hollywood Walk of Fame.