Castel Sant'Angelo

The Castel Sant'Angelo, also known as the Mausoleum of Hadrian, is a towering rotunda in Rome, Italy, that was initially commissioned by Roman Emperor Hadrian as a mausoleum for himself and his family. The building was later converted into a fortress and castle by the popes, who used it as a refuge and a prison, and is now a museum. The mausoleum was originally decorated with a garden top and golden quadriga, but much of its contents and decorations were lost or destroyed over the centuries, including the urns and ashes of the emperors buried there. The building's name, which means "Castle of the Holy Angel," is said to have come from a legend that an archangel appeared atop the mausoleum during the plague of 590.learn more on wikipedia