Dating from at least the 10th century, today Kassel is most famous internationally as the home of Documenta, an every-five-years exhibition of modern and contemporary art. In the late 17th century Kassel received a large influx of Huguenot refugees from France. During the 1800s, it became the capital of the Brothers Grimm's Fairy Tale Route. In 1943, the city was virtually razed by British bombers, leaving few old sights, but the 18th-century Wilhelmshöhe Castle overlooking the city remains.