This underground transport hub doubles as an art gallery.

The haunting complex honors the millions of Ukrainians who died in the forced famine under Soviet rule.

The dining hall that nourishes workers in Chernobyl's Exclusion Zone is also open to visitors.

The biblical sculpture honors those who lost their lives, homes and communities to the Chernobyl disaster.

The deepest metro station in the world.

When you've got to go, you've got to go.

An Art Nouveau building covered in animal gargoyles and grotesques.

One of the largest museums in Ukraine remembers the story of the German-Soviet War in iconic, brutalist style.

340-foot statue built to honour the Heroes of the Soviet Union.

One of the most poignant ruins of the Chernobyl nuclear disaster, the local football team's stadium has been quickly reclaimed by nature.

A reconstructed medieval gateway that was the magnificent entrance to the capital city dating back to 1037.

Vines grow up the metal bars in this public park created from an old machine factory.

One of a series of no-purpose kinetic artworks by Swiss sculptor Jean Tinguely.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

A beautiful but toxic fountain of mercury.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

This semi-secret storybook hedge maze is also the oldest garden in the city.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

This spaceship sculpture in the middle of the Slovakian capital looks like it just crash-landed.

A unique hotel for the artistic soul.

Moscow's other, lesser known kremlin is a fairytale-like cultural complex modeled after Old Russia.

This once-derelict building is now one of the most beautiful bookstores in the world.

This once-forgotten oasis in the middle of Lisbon was first created over a century ago quite by accident.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”