[1] During the German occupation of Luxembourg in the Second World War, the castle was used to accommodate girls assigned to the Reichsarbeitsdient who performed farming and house-keeping work.
Around 1957, it became a guest house and, in 1964, the American firm Monsanto converted it into a hotel.
However business was not very successful and in 1970, the Commune of Rosport bought the castle for its own administrative offices while continuing to rent out the first-floor apartments to vacationers.
In 1981, the celebrations for Tudor's 100th anniversary had included an exhibition on the development of the lead–acid battery, his principal success.
[1] In addition to the museum, the building houses the administrative offices of the Commune of Rosport.