This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

A gigantic statue of a Russian soldier watches over the ancient city of Plovdiv, a prominent reminder of the Soviet period in Bulgaria.

A memorial to the murdered Jews of Kaunas.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

No matter how many times this community-run sauna gets destroyed, it always rises from the ashes.

A collection of modern and vintage pinball machines housed in the cellar of a 15th-century building.

This man-made mound monument was built out of soil from all across the Polish empire.

These plaques found across Warsaw commemorate the sites where executions or battles took place during the German occupation.

A menacing statue of this mythical creature can be seen at the legendary site of the monster's lair.

The world’s narrowest house makes for an awkward, four-foot-wide living space.

A collection of art from Bulgaria's time as a communist state.

A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.

An ornate doorway leads to the former site of one of the city's oldest society of merchants.

The Bristol Camera Obscura housed in an ancient windmill.

Banksy's image of a naked man dangling from the window of a sex health clinic.

A medieval cave used to shelter local hermits now holds nearly 200 old Quaker gravestones.

There's a labyrinth of manmade tunnels stretching for over an acre beneath Bristol.

A statue commemorating a Polish dog who took his role as man's best friend very seriously.

Extremely famous in his native country, this Cracovian painter is all but unknown beyond Polish borders.

Inside this Krakow church, an explosion of psychedelic color.

At first glance, this area seems like just another city park, but the lush landscape hides a dark past.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

Real bones which are said to have belonged to a Polish dragon.