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

The world's largest boar is a huge steel titan found at a French rest stop.

This building’s ghostly exterior reflects its former lives as a prison, school, and funeral home.

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

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

The "stairway to heaven" lookout tower was built to resist weather, arson, and the laws of physics.

A daring D-Day assault by U.S. Army Rangers is commemorated atop the high cliffs of this strategic point.

An effigy of a trapped paratrooper dangles from a Normandy church to commemorate one remarkable D-Day event.

Four alabaster giants contemplate the tides on the shore of Denmark.

These old World War II fortifications have been transformed into an unusual equine attraction.

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

These rustic holiday homes are made from discarded fishing boat hulls.

Tiny memorials honor individual victims of the Holocaust.

It's always summer at the beach inside this former airship hangar.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

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

Visit the ancient, mysterious Roman catacombs ... in the Netherlands.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

This stunning concert hall has become a symbol of Iceland's national recovery.

This wrecked airplane has been sitting on a black sand beach since the 1970s.

These ominous lava formations were said to be an entrance to the netherworld so of course they inspired a famous metal band.