For a long time, no accurate historical data on the construction of the manor were available. However, when the restoration works of the manor were started after the Second World War, a bottle with documents inside was found hidden in the foundations of the building. The documents were written in three languages, Lithuanian, Polish and Latin, and contained information on the construction time of the manor house, the name of the architect and the construction supervisor, and the family tree of the Ogiński family. A letter from Count Michał Ogiński of Plungė was also discovered among the documents. The Count was asking to leave the bottle with the documents where it was found. The wish of Count Michał Ogiński was fulfilled.
Thus, it has been discovered that the manor was consecrated in May 1879. Karl Lorentz, a German architect, designed the manor in the Renaissance Revival style and Gottwied Schranke, also of Germany, was the construction supervisor.
The old two-storey manor house, later demolished by Count Michał Ogiński, stood right in front of the present-day manor. It must be noted that Tsar Alexander I of Russia was a guest at the old manor house in 1807. As of 1994, Plungė Manor has been housing the Samogitian Museum of Art. The museum collection consists of artworks by Samogitian artists from all over the world and introduces the cultural heritage reflecting the history of Plungė Manor.