This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

A historic observatory precariously perched at the "Top of Europe."

A cablecar-station-turned-revolving restaurant with 360-degree views of the Swiss skyline.

A Swiss amusement park entirely dedicated to the theory of ancient astronauts.

'The Letters of Utrecht' lays out a ribbon of poetry one letter at a time, with no final verse in sight.

A floating cat sanctuary on an Amsterdam canal.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

A whimsical bridge uses saxophones to pay tribute to two great men and the European Union.

Nature is slowly overtaking this disused cemetery on the outskirts of Brussels.

Brussels' favorite peeing boy has a sister.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.

A little sculpture with a large wardrobe.

Meet the bronze beloved pet to a family of famous peeing statues.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

You would never come across this tiny green oasis if you didn't know it existed.

A beer pipeline runs beneath Bruges.

The patron of this extravagant Art Nouveau confection insisted that nothing less than a boat should project from its facade.

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

Tiny castle in the middle of the Rhine made you pay to pass.

Centuries of warfare, tragedy, executions, and poetry come together in this 13th-century fortress.

A memorial for a young woman and her ghost, which are claimed to have caused countless deathly shipwrecks.

This fountain of a little boy that spits on passersby at erratic intervals is a town icon.

Every half hour the eye-rolling clock face sticks out its tongue to mock the good citizens of Koblenz.