When the rain falls, this drain system turns into a musical instrument.

Ruins of a German Castle on top of a towering stone pillar.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

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

The birthplace of most all of Europe's space missions is here on the Dutch coast.

This massive collection of taxidermy is full of specimens collected by missionaries during their international travels.

This neighborhood of futuristic ball houses looks like an alien settlement in a science fiction film.

The bridges portrayed on EU currency aren't fictional anymore.

Inspired by "The Starry Night" this Dutch bike path turns into a glowing work of art each night.

A market built atop boats is one of the few floating holiday markets in Europe.

A library where thousands of books explain how to avoid another Great Recession.

This British museum hopes to take the taboo out of poo.

This tiny museum's sizable collection is jammed into a former underground public toilet.

A monster in the plant world, up to 10 feet tall and smelling of death.

The final resting place of soldiers' loyal canine companions.

These barriers stand as stark reminders of Northern Ireland's troubled past.

This public library and its impressive collection of academic books have not changed since the 17th century.

Enormous terracotta heads of Queen Elizabeth and Prince Phillip can be seen on the side of the road to Windsor.

Oxford University's stateliest library seems designed to make students truly feel the weight of knowledge.

This tiny river island switches sovereignty every six months as part of a rare, centuries-old agreement.

At the United Kingdom's only residential library you can sleep among the books.

One of Europe's oldest libraries.

An extraordinary library and archive dedicated to the history of the Arctic and Antarctic poles.

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