The Antique Temple is a small round temple in the west part of Sanssouci Park in Potsdam. Frederick the Great had the building constructed to house his collection of classical works of art, antique artifacts, coins and antique gems. Carl von Gontard created the building in 1768/69 near the New Palace north of the Central Alley, as a complement to the Temple of Friendship situated south of the Alley. Since 1921 the Antique Temple has been used as a mausoleum for members of the House of Hohenzollern and is not open to the public. Usage under Frederick the Great The Antique Temple was, like the Sanssouci Picture Gallery, envisioned from the beginning as a museum and at the time of Frederick the Great could be visited after notifying the castellan at the New Palace. Next to dozens of antique ornaments, such as marble urns, bronze figurines, tools, weights and ceramics, could be found the so-called 'Family of Lycomedes', ten life-sized marble statues on marble plinths. They came to Frederick the Great from the art collection of the French Cardinal Melchior de Polignac. Fifty busts of marble, basalt and bronze sat on brackets, 31 of which also came from Polignac's collection; the rest were from Friedrich's favourite sister, Princess Wilhelmine, Margravine of Brandenburg-Bayreuth. In a square annex that could only be reached through opening a door from the round central hall, the Coin Chamber was created. Four cedar wood cupboards were filled with over 9,200 gold, silver and bronze coins, around 4,370 engraved gems and cameos, 48 marble, terra cotta and bronze reliefs, and books from Frederick the Great's archaeological library. New usage under Frederick William III Frederick William III, who ruled Prussia from 1797, announced in a Cabinet Order on 1 September 1798: "...for the progress of the study of the antiquities and art... the collection of medals and antiques in the Antique Temple in Potsdam shall be united with the similar collections in Berlin and entrusted with the Academy of Sciences..." Consequently, the coin and gem collection were placed in the Antique Chamber of the Berlin City Palace. In 1828 the sculptures and busts followed, which, after being restored in the workshop of the sculptor Christian Daniel Rauch, found their place in the Altes Museum in Lustgarten. The museum was built to the design of the architect Karl Friedrich Schinkel and opened in 1830. In June 1828 Friedrich William