St George's Leprosy Museum depicts the gruesome afflictions of those suffering from the disease.

Hamburgers are intensely proud of their tunnel beneath the river.

Executed in 1401, Exhumed in 1878, Stolen in 2010.

Wax models of disease and deformity are on display at this German medical museum.

Remnants of an exploded schooner and wrecked submarines form a breakwater.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

Finnish lake, and scene of an infamous murder mystery.

When this Iron Age bog body was discovered in 1835, it was thought that she had died recently.

A perfectly circular stronghold constructed in the 10th century is now a nucleus of Viking culture housing a museum, village, and reenactment of an epic Viking battle.

Nearly 40 miles and 1,000 years of limestone mines under Denmark.

Preserved "bog person" that is over 2,000 years old.

This Danish rock field is actually a sprawling ancient cemetery holding the bodies of 700 Vikings.

Iron Age "bog person" preserved for over 2,300 years.

This secret collection of the strange and occult was rediscovered in a forgotten room of an old house.

A natural wonder in south Denmark.

Old Danish castle immortalized in Shakespeare's Hamlet.

Six beautiful wooden giants are hidden around Copenhagen.

Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

A magical and peaceful ruined Cistercian abbey in what is now southern Belgium.

The 14th-century ruins are said to contain healing powers.

The sanctuary holds what was once believed to be the saint's incorruptible tongue.

An army of sleeping knights sculpted by a self-taught local artist beautifully depict an old Czech legend.

A former top secret nuclear fallout shelter now operates like a hotel stuck in the Cold War.