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

This oddly shaped building is a surprising Soviet-era crematorium.

This derelict superstructure was a very important warning system for the Soviet military.

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

This beautiful natural train tunnel is said to grant the wishes of visiting lovebirds.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

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

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

This Romanian village may have been drowned, but it is long from forgotten.

This hauntingly beautiful cemetery outside a medieval citadel is full of winding paths and ivy-covered graves.

This enormous abandoned prison was once dubbed the "Bastille of Romania."

Romania's only crater lake with water as pure as if distilled.

Something's watching you.

No one knows who built this strange cave of worship or exactly why.

A giant portrait of an ancient king looms over the river.

This solitary monastery may hold the remains of Vlad the Impaler (but probably not).

A small town Romanian cemetery filled with darkly humorous gravestones.

Moss and stone turn this waterfall into an otherworldly liquid veil.

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

A misnamed well, with a deep dark past.

Popular river that runs through the remote Serbian municipality of Leskovac.

Abstract monuments express sorrow and resilience at the site of a horrific massacre in Nazi-occupied Serbia.

An abandoned monument remembering the "Pančevo Holocaust" now stands as a shadow of its former self.

A hidden stream deep in the mountains creates one of the largest tufa waterfalls in Serbia.