Basilica of Saints Bonifacio and Alessio

The church of Sant'Anselmo all'Aventino, despite its appearance, is a recent construction. It was built in a neo-Romanesque style by Francesco Vespignani between 1892 and 1896. The interior consists of a nave and two aisles divided by granite columns, a latticed ceiling and an apse decorated with mosaics; the crypt with five aisles is particularly large. The church is built on the remains of a Roman Domus of the 2nd-3rd century AD, which can be seen in the basement of the church.

The church and convent of Santa Cecilia in Trastavere in Rome was built on the site of the home of St. Cecilia, a martyr of the 3rd century. Her mutilated body was found incorrupt in 1599; a statue under the altar depicts the way it was found. Excavations of Cecilia's Roman house can be explored underneath the church.

The Basilica of Santa Maria in Cosmedin is the result of the enlargement under Pope Hadrian I (772-790) of an ancient Christian place of worship attested since the 6th century. It also underwent a major renovation in 1123, making it one of the few examples of 12th-century sacred architecture in Rome. It is known to house the Bocca Della Verità. The 8th-century crypt has a rectangular plan, with a flat ceiling, and a tripartite hall with naves of four bays each with Corinthian columns. A peculiarity of this crypt is the transept, one of the rare cases of reintroduction of this element, typically Constantinian, into Carolingian architecture.