An imperial church bombed to ruins during WWII now stands as a jagged memorial.

Cold war icon and onetime "hole" in the iron curtain.

Berlin's beloved bear is immortalized at the Museum für Naturkunde.

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.

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

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

On Gellért Hill, this statue depicts the tragic tale of lovers divided by the Danube.

The holes in this wall provide a glimpse into Jewish life in Budapest, both past and present.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

A triumphant marble and bronze fountain depicting a 15th-century Hungarian king and his hunting party.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Museum dedicated to the terror regimes of Hungary.

This easily overlooked memorial immortalizes the scars from the 1956 Hungarian Revolution.

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

An islet filled with wooden houses where the open sea meets a lagoon.

This ancient structure appears Roman, but was constructed during the 16th century and was utilized until 1911.

The Greek island's old British cemetery feels like a forgotten garden.

The ghost town where the villagers refuse to leave.

One of the largest ossuaries in Spain is packed from floor to ceiling with bones.

The ruins of a 2,000-year-old Roman fishing village perched on one of the best beaches in Spain.

A deer-headed statue that brings together a 12th-century legend and big wave surfing.

This huge abandoned fortress hidden inside a mountain holds a world of subterranean secrets.