Pantheon, Castel St. Angelo, Capitoline Museum
The Pantheon, built around 100 AD, has the largest dome ever built of unreinforced concrete. There are several notable tombs within, including Kings Vitorio Emanuel II and Umberto I.
Wikipedia article http://en.wikipedia.org/wiki/Pantheon,_Rome
Castel St. Angelo
The Mausoleum of Hadrian, usually known as the Castel Sant'Angelo, is a towering cylindrical building in Rome. It was initially commissioned by the Roman Emperor Hadrian as a mausoleum for himself and his family. The building was later used by the popes as a fortress and castle, and is now a museum. [Wikipedia] see full Wiki article.
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Views of the city from the terrace are excellent! This terrace is the setting for the final act of Puccini's Tosca. At the end of the opera, Tosca jumps off to end it all.
King Vittorio Emanuel II Monument
the Monument at ground level
Capitoline Museum, just up the hill from Forum, has a wonderful classical sculpture collection.
see Wiki article http://en.wikipedia.org/wiki/Capitoline_Museums
Romulus and Remus nursed by a Wolf -- a frequently seen symbolic sculpture around Rome. Artemis, goddess of fertility, also frequently seen.
New sculpture gallery
Yet another small excavation, on the way down the Capitoline Hill to the Vitorio Emmanuel monument
back to Rome Fountains and Piazzas