It was not until the reign of Frederick William IV that the Nikolai Church received its current domed roof, as planned by Schinkel, who took the Panthéon in Paris and St. Paul's Cathedral in London as his models. Unfortunately, the church was almost completely destroyed at the end of the Second World War and was not rebuilt until 1981. St. Nicholas Church stands on the Old Market Square, where the Old City Hall, an obelisk and the rebuilt Fortuna Portal are also located. The portal represents the former entrance to the Potsdam City Palace, which was once located on this site. In 1960, this was demolished due to severe destruction during World War II.