BDSM, 1930s Style.

Montmartre's sole surviving windmill became an iconic landmark for 19th-century painters, artists, and bohemians.

Locals affectionately dubbed this World War I memorial "Tommy."

The remains of 50,000 World War I soldiers rest under a towering arch overlooking the Alpine battlefields.

The recreated ruins of a house designed to memorialize a World War I shelling on the town.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

A square stone tomb marks the spot where six men were killed while holding a service in Caldoris Wood.

One man and his dog, immortalized in a giant statue.

A striking memorial to the Jews of Leiden who were murdered during World War II is scattered throughout the city.

A striking memorial recalls thousands of Bolognese men and women killed fighting fascists in World War II.

The second smallest castle keep in England.

This striking fort on the Maginot Line looks just as it did after being destroyed in the Fall of France.

In an arboretum with hundreds of memorials to the fallen, this one might be the most poignant.

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

A monument at the site of a decisive battle in the First English Civil War.

A quiet country churchyard holds a monument to the last known sin-eater in England.

A monument to the thousands of Canadian soldiers who died capturing the French ridge during World War I.

The 16th-century church was kept in its ruined state as a reminder of the casualties of World War I.

A plaque hangs near the execution place of the Scottish Independence leader famously depicted in "Braveheart."

A tribute to the intrepid explorer and his crew who perished in terrible conditions on an ill-fated expedition to the Arctic.

A unique tribute to the millions of animals who served and died for the British military.

A bronze bust commemorates the heroism of the secret agents who led covert operations against the Nazis.

The spot where three Protestant clergymen were burned at the stake during the reign of "Bloody Mary."

This memorial to the thousands of Indian dead during WWI was callously used for target practice during WWII.