A relic of the Cold War tucked away in the forested hills above Bratislava.

A geological oddity topped with a 2,000-year-old pagan temple.

A tiny museum dedicated exclusively to the tiny art that decorates matchboxes.

The majority of the highest mountain in Poland is actually located in a different country.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The inverted pyramid design of this station stands out amid Bratislava's urban landscape.

A massive sculpture of an obscure Celtic coin that has become a symbol in Slovakia.

This vestige of Seychelles’s colonial past now resides in a busy intersection and didn’t chime for its first 96 years.

An 11th-century Byzantine church with medieval Serbian history and spectacular views.

Featured in one of the most iconic scenes in cinema history.

This abandoned Olympic skiing facility still bears the scars of the Siege of Sarajevo.

Some of the greatest minds in the history of Hungarian art and science converged in this café.

The largest catacomb system in the world.

A forgotten remnant of the Soviet Union, Transnistria is an unrecognized country hidden behind a heavily militarized border between Moldova and Ukraine.

At less than four inches in height, this iconic fictional character is the smallest public statue in all of Moldova.

This abandoned Soviet circus is slowly being restored to its Communist-era glory.

Seventy-five miles of limestone caves host more than a million bottles of wine beneath a sleepy Moldovan town.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

Uh, pardon me, ma'am, but I couldn't help noticing that there's a Columbo statue in the middle of Budapest.

Sitting beneath an unremarkable residential building is a museum devoted to classic Pinball.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

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

The charmingly disheveled clock tower of Tbilisi's puppet theater.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.