Peace Park and the Atomic Bomb Dome.

A beautiful 19th-century mansion slowly crumbled and became a 'ghost house' after World War II.

Legend has it fairies gathered at the site of this medieval castle.

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

A museum dedicated to the former country.

A pair of connected skyscrapers form this symbolic gateway.

Created as a "model concentration camp" to hide Nazi atrocities from the international community, this former camp-ghetto now holds a museum and memorial honoring the lives lost within.

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

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

Monumental sculptures guard many of the graves, transforming this necropolis into an open-air fine art museum.

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

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.

The largest wine cellar in the world is a 150-mile network of underground caves near the capital of Moldova.

The largest catacomb system in the world.

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

Last remaining nuclear missile base in Ukraine.

Ukraine's oldest operating pharmacy now offers guests a fascinating walk through apothecary history.

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

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

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

This attraction was abandoned after the Chornobyl disaster.

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

This exquisite, alienesque piece of Soviet architecture is being threatened by modern shopping malls.