Castel Sant'Angelo, Rome

The splendid fortress of Castel SantAngelo was originally built as a mausoleum for Emperor Hadrian in 139 CE. It was transformed into a castle during the 10th century and then transformed into the elegant residence of Pope Alexander VI Borgia 500 years later. Michelangelo designed the marvelous main court for Pope Leo X and many of the rooms inside are decorated with frescoes of great beauty. It has also been used to house prisoners, including the sculptor Benvenuto Cellini. The terrace offers a fine view of Tiber River. Opera lovers will know that this is where the final act of Giacomo Puccinis opera Tosca was set. The building now hosts a museum with a fine collection of suits of armor, ceramics, sculptures, and paintings.