After exploring the mysterious Catacombs situated on the old Appian way, totalling some 150 kilometres of underground tunnels and galleries used as cemeteries by early Christians during roman persecutions, see the  vast tracks of the  Circus Maximus where 180 thousand inflamed spectators could fervently incite their favourite heroes to victory and view the sprawling Emperors' Palaces on Palatine Hill. Courageously dare placing your hand in the oldest “lie detector” in the world,  the famous “Mouth of Truth”  and then continue your walk to admire the well-preserved Temples of Hercules and of Portunus situated on the banks of the Tiber. Discover the most recent archaeological excavation site  in Rome to visit the  Portico D’Ottavia, Theatre of Marcellus and the nearby old Jewish Ghetto . Conclude your  tour at the authentic spot of  Julius Caesar’s assassination  on the  Ides of March, 44 B.C. and now refuge to thousands of street-cats.