The Basilica di 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, and beneath that, a 1st-century Roman house. This layered architecture showcases the evolution of Christian worship and Roman life over centuries. Visitors can explore the richly decorated interiors, featuring stunning mosaics and frescoes. The basilica is dedicated to Saint Clement, an early pope and martyr, and is an important site for understanding the early Christian community in Rome.