Kassel (population 201,000 in 2020) is the most important city of North Hesse. It is known around the world for the documenta exhibitions of contemporary art every five years. Furthermore, the "Bergpark Wilhelmshöhe" with its water displays received the title "UNESCO-World Heritage Site" in 2013.
Kassel traces its history to a first mention in 913 CE, but archaeological finds indicate human habitation at this site predating the 10th century. And the city would soon become a centre and later residence of the Landgraviate of Hesse.
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