- Largest online source of information on St. Peter's Basilica and Square in the Vatican City. Lacus Curtius website: Circus of Nero, plan superposed with the Basilicas, showing the tomb of Peter, and text by Rodolfo Lanciani describing the largely inadvertent archaeology. Buildings and structures completed in the 1st century Buildings and structures demolished in the 15th century Nero Former buildings and structures in Italy Caligula Nero 1st-century establishments in Italy 15th-century disestablishments in Italy