No opera is more tied to its setting than Tosca, which takes place in Rome on the morning of June 17, 1800, through dawn the following day. The specified settings for each of the three acts—the Church of Sant’Andrea della Valle, Palazzo Farnese, and Castel Sant’Angelo—are familiar monuments in the city and can still be visited today. While the libretto takes some liberties with the facts, historical issues form a basis for the opera: the people of Rome are awaiting news of the Battle of Marengo in northern Italy, which will decide the fate of their symbolically powerful city.