A subterranean Holocaust refuge within one of the world's longest cave systems.

This unassuming museum's slogan translates to “there is a limit of sadness, anxiety has no limits."

The largest collection of death masks in Ukraine.

The eerie burnt-out remains of a prominent building where 30 protestors lost their lives.

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

There is a mouldering Jewish cemetery hidden away in the capital of Moldova.

The spectacular Roshen Fountain show lights up the night sky all summer long, until it "hibernates" under the ice waiting for spring to come.

The largest catacomb system in the world.

Elaborate mansions built by Roma residents in Soroca to show their success after centuries of discrimination.

For over 40 years, this quaint little house has teetered on a rock in the middle of a river.

When Croatia became independent of Yugoslavia, the splintering governments left behind these concrete tunnels.

Some of the best-preserved specimens of the monumental medieval tombstones found throughout Bosnia and Herzegovina.

Place with alleged mystical powers in Old Orthodox Church in Sarajevo.

A number of craters left by fatal mortar strikes have been filled with red resin to remember those lost during the Siege of Sarajevo.

This historic timepiece is thought to be the only public clock in the world that keeps lunar time.

Oriental bazaar in the heart of Sarajevo.

This historic cemetery was inaccessible for several years due to dozens of land mines.

This museum preserves the hand-dug tunnel that kept Sarajevo afloat during the Serbian siege.

A war-torn Olympic relic is being overtaken by graffiti and nature.

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

There's a mini version of Iguazu Falls hidden in the Balkans, and it's got a rope swing.

This surreal memorial/cemetery is a necropolis of crumbling stonework and puzzle-shaped headstones.

Bridge that died in war and was resurected.

This Croatian island is for sale but no one is buying due to the dozens of accused Nazi sympathizers who were massacred there after WWII.