The great Danube river starts here.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

A maze of crosses marks the jumbled divide between the Netherlands and Belgium.

High in the clouds of San Marino sits an ancient tower with some curious prisoner graffiti.

Apartment complexes built into huge repurposed natural gas tanks.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

A miniature city, once ruled by the Queen of the Netherlands.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

This unattributed sculpture in Amsterdam is hiding in plain sight.

The fairy tale castle of the "fairy-tale king."

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

Building Men of War and Indiamen from Holland's Golden Age.

This giant wire frame man sculpture is crouched in contemplation.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

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

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

The deepest metro station in the world.

A reconstructed medieval gateway that was the magnificent entrance to the capital city dating back to 1037.

A castle perched precariously over the Crimean Sea.

This magnificent Crimean estate was once a playground of the Russian elite.

Over 300 wood sculptures depicting characters from Slavic, Greek and Western folk tales fill this magical garden.

The ancient ruins of an extinguished city amidst the bustle of a modern one.