The Cathedral of San Pietro, also known as the St. Peter's Cathedral, is a prominent church located in Vatican City. It is one of the largest and most renowned churches in the world, known for its stunning architecture and historical significance. The cathedral was designed by famous architects, including Michelangelo, and features a magnificent dome that dominates the skyline. Construction of the cathedral began in 1506 and was completed in 1626. It serves as a major pilgrimage site for Catholics and is the burial site of several popes. The interior is adorned with beautiful artworks, including the famous Pietà sculpture by Michelangelo.