The Basilica of San Clemente is a historic church located in Rome, Italy. It is known for its unique three-tiered structure, which includes a 12th-century basilica built over a 4th-century church, which in turn was built over a Roman house from the 1st century. This layering reflects the rich history of the site and showcases various architectural styles. Visitors can explore the beautifully decorated interiors, featuring stunning mosaics and frescoes. The basilica is dedicated to San Clemente, a pope and martyr, and is an important pilgrimage site. Its archaeological significance offers insights into early Christian worship and Roman life.