This small chapel built into rock is the oldest place of worship in Luxembourg.

A German shoemaker-turned-folk-hero whose impersonation of a Prussian military officer earned international notoriety.

A neighborhood church's unusual abstract stained glass was the final project of avant-garde artist Jean Cocteau.

A neo-gothic statue modeled on German Emperor Kaiser Wilhelm II, which had its distinctive mustache shaved off by Nazis in World War II.

Two standing giants remain as a tribute to Luxembourg's metallurgical past.

A 600-year-old elm tree with a built-in seat and thatched roof.

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

A towering baroque basilica jutting out of the French countryside.

A unique museum tells the story of the day-to-day life of World War I soldiers.

The remains of 40,000 humans, meticulously stacked in a tiny churchyard shed.

A memorial to the soldiers who died in the bloody battles to control Verdun in World War I.

Site of one of World War I's most horrific scenes.

A swath of France so devastated by war it is still forbidden to go there.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

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

A ruined castle stands atop a hill surrounded by dragon lore.

Centuries of warfare, tragedy, executions, and poetry come together in this 13th-century fortress.

This German art chapel is perfect for those who like their worship hard, modern, and utterly alien.

The highest cold-water geyser in the world.

This 600-year-old home seems to defy physics.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

This concrete church spent a period of its history as a World War II bunker.

This former steel and coal plant is now a neon-lit industrial fantasia.

No need to strap in for a “ride” on this walkable roller coaster.