The Great Cairn of Barnenez, France
The term "cairn," which has Gaelic origins, refers to a human-made pile of stones. These structures, found worldwide in various forms, are most commonly seen in Europe, where they have historically been used as route markers and burial mounds. The Great Cairn of Barnenez, a chambered cairn, is regarded as one of the oldest and largest of its kind. Located near Finistère in France’s Brittany region, the structure stands eight meters tall, extends 72 meters in length, and reaches a width of 25 meters at its broadest point.