The Průhonice Park along with Průhonice Castle are a Czech National Historic Landmark and a UNESCO World Heritage site. The current appearance of the Průhonice Castle dates to the late 19th century. The natural park (area of 250 hectares) was founded in 1885 by Count Arnošt Emanuel Silva-Tarouca who took advantage of the miscellaneous valley of the stream Botič and its tributaries, the Dobřejovický and Zdiměřický streams. Apart from its artistic and historic significance, the park is also valuable from the dendrological point of view with its collection of about 1,600 species of local and exotic plants. The collection of rhododendrons is particularly unique. There are about 8,000 rhododendrons within 100 taxa and cultivars. The Průhonice park itself is the most significant landscape element southeast of Prague and an important haven for the variety of organisms in this part of the Czech Republic.
More information about the history of the park and the castle is available on the official website here.