The Papal Basilica of St. Peter, located in Vatican City, is one of the largest and most renowned churches in the world. It serves as a major pilgrimage site and is the spiritual center for the Roman Catholic Church. The basilica is built over the tomb of Saint Peter, one of Jesus' apostles and the first Pope, making it a significant location for Christians. Construction of the basilica began in 1506 and was completed in 1626, featuring contributions from famous artists like Michelangelo and Bernini. Its stunning architecture includes a grand dome, intricate mosaics, and the famous Pietà sculpture, attracting millions of visitors each year.