Kassel - Wilhelmshöhe
Bergpark Wilhelmshöhe is a unique landscape park in Kassel, Germany. The area of the park is 2.4 square kilometres (590 acres), making it the largest European hillside park, and second largest park on a mountain slope in the world. Construction of the Bergpark, or "mountain park", began in 1696 at the behest of the Landgraves of Hesse-Kassel and took about 150 years. On 23 June 2013 it was proclaimed as a World Heritage Site during the UNESCO meeting in Phnom Penh.