This tour takes you to the Mausoleum of Hadrian (usually known as Castel Sant’Angelo is a towering cylindrical building walking distance from Saint Peter’s basilica that 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) and to the undergrounds of piazza Navona (under the beautiful square the ruins left of the Stadium of Domiziano-first Roman stadium exclusively dedicated to games similar to our modern Olympic Games).