This former estate of a fascist leader is now a burnt out ruin leading to a system of secret tunnels.

The remains of a sunken military ship wreck visible through clear water.

This truly palatial work of Communist-era architecture now sits crumbling on a Croatian beach.

An abandoned saucer-shaped monument in the Bulgarian mountains.

This abandoned airplane hanger is said to have once been a top secret launch facility.

One of the oldest bank museums in Europe showcases unusual currencies of the world and other money-related miscellanea.

Abandoned since 1998, this train station has become an oasis for urban explorers.

Dummies recreate radiological discoveries from history.

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

The place where World War I began.

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

Dozens of Soviet-era trains and carriages fill this outdoor museum.

A monument in the Belarusian city of Polotsk claims to mark the exact midpoint of the European continent.

A striking Soviet memorial commemorates the liberation of Belarus from the Nazis.

This Minsk museum has cat coffee, cat chess, cat art, and even a cat "staff," which visitors are free to take home.

Take Soviet nostalgia to new heights by toasting the first man in space over a full spread of Belarusian and Soviet fare.

Remnants of the city's Soviet history hover over this modern fast-food outlet.

This rare collection of human deformities displays fetuses with two faces, one eye, and "mermaid" legs.

Thanks to its heroic service during WWII this Soviet castle has been turned into a monument towered over by a brutalist titan.

The world's largest collection of intentionally useless inventions.

On a winding Vienna side street, one museum has turned their windows into a monument to history’s peace-minded heroes.

Museum devoted to the artificial language of Esperanto.

Collection dedicated to funeral rites, equipment, and mourning rituals of the Viennese.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.