The perfectly preserved underground rooms where Churchill plotted the war against Germany.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

This 11th century tower is said to be the oldest building in Oxford.

Sometimes an island, sometimes a rocky outcropping connected to the world by a tiny suspension bridge.

Edinburgh's oldest statue hides within a parking lot behind the city's iconic cathedral.

Touching this 18th-century Scottish philosopher’s toe allegedly conjures good fortune.

3,000 market stands in five former Zeppelin hangars.

Latvia's symbolic mountain-shaped national library is home to millions of cultural tomes.

This inexpensive lodging house was once a prison notorious for its inhumane practices.

A moving memorial to the fallen and missing from WWI trenches.

This memorial museum chronicles the apocalyptic destruction of the First World War.

A rare example of World War I trenches from the British front.

The site where one of the most famous poems of World War I was composed is preserved to honor the legacy of the work.

Christ's blood preserved in a Belgian town.

A little sculpture with a large wardrobe.

The prototype for all Nazi concentration camps.

The celebrated eyesore created by starry-eyed sweethearts.

This bridge was constructed from the rubble of the infamous Bastille.

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

Tiny memorials honor individual victims of the Holocaust.

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

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

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.