Old Basilica outline (Rome)

 basilica, place with historical importance, invisible, historical layer / disappeared object

Old Saint Peter's Basilica was the building that once stood on the spot where the Basilica of Saint Peter stands today in Rome from the 4th to 16th centuries. Construction of the Basilica, built over the historical site of the Circus of Nero, began during the reign of emperor Constantine I. The name Old Saint Peter's Basilica has been used since the construction of the current basilica to distinguish the two buildings.
Since the crucifixion and burial of Saint Peter in 64 A.D., the spot was thought to be the location of the tomb of Saint Peter, where there stood a small shrine. With its increasing prestige the church became richly decorated with statues, furnishings and elaborate chandeliers, and side tombs and altars were continuously added.
Construction was begun on the orders of the Roman emperor Constantine I between 326 and 333, and took about 30 years to complete. The design was a typical basilica form. Over the next twelve centuries the church would gradually gain in importance, and even become a major place of pilgrimage in Rome. Papal coronations began to be held here, and in 800, Charlemagne was crowned emperor of the Holy Roman Empire. However the church was falling to ruin by the 15th century

www.youtube.com/watch?v=sbh1HdqkEiA
The structure was completely filled with tombs and bones of saints and popes.
Bones continued to be found in construction as late as February 1544. In the end, the design of the new basilica attempted to reconsecrate these remains as much as possible