Op-art architecture designed for happiness.

In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.

This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.

The unsettling remnants of a torn down movie set lies nearby the ruined location of the actual Płaszów Labor Camp.

Seven dragon statues—including one that breathes real fire—are scattered throughout the streets of Krakow.

Krakow's own version of the Hollywood Walk of Fame.

A mysterious concrete hand reaches out from between the stones of Uniwersytecki bridge.

It’s a painted window that looks completely real, hiding on a building in the market square.

A 90-ton, gravity-defiant steam locomotive shoots for the skies in this bizarrely beautiful public artwork.

A striking public sculpture representing the period of martial law in Communist Poland.

A collection of old neon signs from all over Poland line a secluded courtyard.

The silly symbol for an underground protest group is now scattered around the city.

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

Museum dedicated to the terror regimes of Hungary.

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

This abandoned Slovenian military barracks has become a punky-political art squat.

The smaller of the three towers of San Marino is a former prison inaccessible from the ground level.

High in the clouds of San Marino sits an ancient tower with some curious prisoner graffiti.

Shakespeare has been brought to life in this open air theater for the better part of a century.

A public fountain that spouts "health water" from a nearby spring.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

This museum is home to one of the largest private collections of seashells in Australia.