Kassel is a city in central Germany, located in the state of Hesse. It is known for its rich history and cultural heritage, including the famous Bergpark Wilhelmshöhe, a UNESCO World Heritage site featuring stunning gardens and the impressive Hercules monument. The city is also home to the documenta, one of the world's most important exhibitions of contemporary art, held every five years. Kassel has a population of around 200,000 residents and offers a mix of modern amenities and historical attractions, making it a vibrant place to live and visit.