This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.

Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

A walkable map of the world, made from soil and stone by one man.

Stroll past dozens of intricately-detailed scale replicas of buildings from all over Czechia.

Heralded as one of the prettiest castles in all of Czechia.

Massive installation of Europe's negative stereotypes.

A massive, abstract lookout tower providing a panoramic view of Prague.

A former top secret nuclear fallout shelter now operates like a hotel stuck in the Cold War.

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

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

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

A bus with a butt and biceps to put Olympic athletes to shame.

A sculpture of the iconic East German car on four legs is a tribute to those who traveled to Prague seeking asylum.

The world's greatest slide descends 18 stories from this looping mountaintop viewing platform.

An Orwellian sculpture with eyeball cameras watches passersby.

This artificial cave looks like something out of a fairytale.

An eerie, existential museum dedicated to the author of "The Metamorphosis."

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

Buried five stories underground, this Soviet bunker is packed with gas masks and Cold War paraphernalia.

The risqué mixed-media sculptures are supposedly a metaphor for Czech politics.

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.

Two stunning 17th-century libraries and a cabinet of curiosities.

The largest caravanserai in Cyprus also includes amazing examples of Ottoman architecture.