The Cathedral of St. 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 cathedral is famous for its stunning architecture, including the iconic dome designed by Michelangelo. Construction of the cathedral began in 1506 and was completed in 1626. It is built over the site where St. Peter, one of Jesus' apostles, is believed to be buried. The interior features remarkable artworks, including the famous sculpture Pietà by Michelangelo and the grand altar, attracting millions of visitors each year.