Christmas Holiday Palaces regularly open Ferry Peacock Island in operation 31 December, New Year's Eve Visitor Centers and Sanssouci Palace, New Palace, Charlottenburg Palace (Old Palace & New Wing), Rheinsberg [...] 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 [...] regularly open (except New Pavilion) additional: Steam Engine Building and Flatow Tower in Babelsberg Park 2 May, Bridge Day after May Day Palaces regularly open (except New Pavilion) additional: Flatow Tower