Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

Peek through a transparent pyramid and drink in the mountain made of books.

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

Cat art as far as the eye can see.

A floating cat sanctuary on an Amsterdam canal.

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

Thousands of slain Soviet soldiers are buried within the shadow of this enormous obelisk.

A unique hotel for the artistic soul.

The blood-soaked ruins of the castle where the murderous Blood Countess was walled in alive.

A massive 1830s industrial site once known as Czechia's "Iron Heart" has been transformed into a playground of science, technology, and art.

A series of playful yellow penguins share a serious message about the environment.

A controversial artwork draws attention to the dark history of Prague's "Suicide Bridge."

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

Looming communist pillar with a Czech twist.

A saintly relic hidden in a Prague church basement.

This doorless 20th-century elevator doesn't stop or slow down.

A steampunk-styled three-floor factory churning out art, activism, and electronic beats.

A Jenga-style cylindrical tower of books that appears to go on forever.

Countless grotesque faces stare out from this eerie Prague art wall.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

The housing complex served as an anti-fascist fortress during the Austrian Civil War.