During the Warsaw Uprising of 1794 , the stairs leading to the main entrance were destroyed .
During the Warsaw Uprising of 1794 , the stairs leading to the main entrance were had to be replaced with new ones designed by Chrystian Piotr Aigner .
During the Warsaw Uprising of 1794 , the stairs leading to the main entrance were destroyed and had to be replaced with new ones designed by Chrystian Piotr Aigner .