The Castle can be visited
Museum
Branitz Castle

In the center of the park lies the castle, built in Baroque style from 1770 to 1772 and remodeled around 1850. Today, it houses the Fürst Pückler Museum. It showcases historic living quarters as well as exhibitions on the life and work of Hermann von Pückler-Muskau and a painting collection of works by the landscape painter Carl Blechen, born in Cottbus. Additionally, the Marstall regularly hosts special exhibitions.
Among the special features of Branitz Park are the pyramids. The larger water pyramid, erected in 1856/57, represents an artificial island in the lake. Inside the tumulus lie the graves of Pückler and his wife Lucie von Pückler-Muskau, who died in 1854 and was reinterred after the Prince's death. On the southeastern shore of the lake is the stepped land pyramid.
Park+
Branitz Park is a landscape park designed by Prince Pückler-Muskau near Branitz in Cottbus. The estate came into the possession of the Pückler count family in 1696. At that time still leased, the design of the park began in 1845 when Hermann von Pückler-Muskau had to give up his then residence, Muskau Castle in Muskau, and its park due to financial problems and moved to Branitz. Here he began to create this further landscape park modeled on English examples, which was to become one of the most beautiful in Lusatia.
Through his park creations, especially that of Branitz Park, Pückler-Muskau became one of the most famous German garden designers of the 19th century, alongside Peter Joseph Lenné and Friedrich Ludwig Sckell. As Pückler's successor, Heinrich von Pückler completed the park.
Source: Wikipedia · Licence: CC BY-SA 4.0
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 51.7421, 14.3690