The Treasure Room (la Sala del tesoro; La salle du tr閟or; Schatzkammer): in 1585 pope Sixtus V (pape Sixte V) decided to store valuable objects and cash here. The huge strong box has six locks; each with a different key.- The Castel Sant'Angelo (Castle of the Holy Angel; Chateau Saint-Ange; Die Engelsburg ) is a towering cylindrical building in Rome.- Construction: 123-139 AD; commissioned by the Roman Emperor Hadrian as a mausoleum for himself and his family.(Mausoleum of Hadrian; Mausol閑 d'Hadrien; Mausoleum des Kaisers Hadrian; Mausoleo di Adriano). The building was later used by the popes as a fortress and castle; and is now a museum. (Museo Nazionale di Castel Sant'Angelo)Rome; Italy. 2020.