Island in operation 31 December, New Year's Eve Visitor Centers and Sanssouci Palace, New Palace, Charlottenburg Palace (Old Palace & New Wing), Rheinsberg House open until 2.30 p.m (last admission 2 p [...] Good Friday Palaces regularly open (except New Pavilion) 20 April, Easter Sunday Palaces regularly open 21 April, Easter Monday Palaces regularly open (except New Pavilion) 1 May, May Day Palaces regularly [...] Bridge Day after May Day Palaces regularly open (except New Pavilion) additional: Flatow Tower in Babelsberg Park 14 May, works meeting all palaces closed 29 May, Ascension Day Palaces regularly open (except