Prins Eugens Waldemarsudde, is a museum located on Djurgården in central Stockholm.
It was the former home of the Swedish Prince Eugen, who discovered the place in 1892, when he rented a house there for a few days.
The complex consists of a castle-like main building—the Mansion—completed in 1905, and the Gallery Building, added in 1913. The estate also includes the original manor-house building, known as the Old House and an old linseed mill, both dating back to the 1780s.
Source:
waldemarsudde.se