The Cathedral of Saint Peter, also known as St. Peter's Basilica, is a renowned church located in Vatican City. It is one of the largest and most important churches in the world, serving as a major pilgrimage site for Catholics. The basilica is famous for its stunning architecture, particularly its grand dome designed by Michelangelo. Construction of the cathedral began in 1506 and was completed in 1626. It is built over the tomb of Saint Peter, one of Jesus' apostles and the first Pope. The interior features remarkable artworks, including Bernini's Baldachin and the Pietà sculpture, attracting millions of visitors each year.