One of the best ways to move through the city of Rome is by using public transportation, as Subways/Bus. Thus, it is recommended to purchase the CIS (Carta Integrata Settimanale), valid for seven consecutive days and costs about €16.00. All tickets start to count from the moment you validate them for the first time at the validation points, located at TheTermini Station or The Republic Station.
According to Rome Museum website - The St. Peter's Basilica is one of the largest buildings in the world and is the largest of the papal basilicas. At the moment the St. Peter's Basilica is a building that measures 218 meters of length and 136 meters of height including its dome. It has an area of 23,000 square meters. This basilica has been considered as an architectural work of great importance by the magnitude of its facade and by the quality of its work, annually receives people of diverse countries of the world who come to its interior to admire the best sculptures of the times and appreciate a work that has had centuries of construction.