Flamboyant architecture from the turn of 20th century.

3,000 market stands in five former Zeppelin hangars.

The monumental home of Prussia’s eccentric "Cannon King."

This monolithic slab of art metal crowns a German slag heap.

The Bauhaus-style former industrial complex is considered the world's most beautiful coal mine.

Over time, this castle grew to encompass the entire island.

This 1920s Amsterdam neighborhood was built as a giant experiment in concrete construction.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

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

Established in 1638 to battle the Black Death, this botanical garden is a treasure trove of rare flora.

Sail in for a ’dam good slice.

A suspended footbridge allows for traversing this gorge carved through the French Alps.

A huge old mansion full of thousands of toys, each there to be used and played with.

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.

The great Danube river starts here.

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

Take a stroll through the hellish grotesques of Hieronymus Bosch in this elaborate Netherlands church.

At this museum in Iceland, visitors can sample fermented Greenland shark.

Rich with fauna and flora, nature-lovers can walk across the sea at this UNESCO World Heritage spot.

The sunken structure looks like the victim of a catastrophic flood.

This submersible road connecting a French island to the mainland is lined with safety towers for when the tide strands travelers.

An aluminum skeleton brings Chinese mythology to the French shore.

Even France's favorite aquatic son Jacques Cousteau, couldn't get to the bottom of it.