A curious cave church carved into the face of a cliff.

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

The haunting complex honors the millions of Ukrainians who died in the forced famine under Soviet rule.

The deepest metro station in the world.

340-foot statue built to honour the Heroes of the Soviet Union.

A mysterious emblem tucked in an small alleyway is actually the coat of arms of a heroic medieval family.

A floundering Polish shipyard was once the soul of the Solidarity movement that capsized communism.

A huge wooden clock that is so beautiful its creator was forcibly blinded.

Dancing skeletal figures pay homage to a medieval mural destroyed during World War II.

The final resting place of many of Germany's most famous communists.

This Rococo church is known as the most beautiful village church in the world, and does not disappoint.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

The bells remain in a shattered heap exactly as they fell when the church was bombed in World War II.

The last bastion of Roman presence north of the Alps looms over a German town.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

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

This peculiar border irregularity is the only way to legally enter Russia without a visa.

Dolls of all shapes and sizes display the eras of femininity in this spooky and beautiful collection.

The celebrated eyesore created by starry-eyed sweethearts.

What if all public housing projects had been designed by "the Pygmalion of modern architecture," not only their prototype?

The experimental test tracks of a retro-futuristic monorail still stand in the French countryside.

Remains of the artificial harbours invented for the Allied invasion of Normandy can still be seen at sea.

Small French town or alien garage?

This former limestone quarry is now a subterranean wonderland of grand stonework.