Lednice is a village in South Moravia in the Czech Republic. In 1996 it was inscribed on the UNESCO World Heritage List (together with the twin manor of Valtice) as "an exceptional example of the designed landscape that evolved in the Enlightenment and afterwards under the care of a single family." It contains a palace and the largest park in the country, which covers 200 km². (source)
Thank you Radim!