In Republican-era Rome the Caelian Hill was a fashionable residential district and the site of residences of the wealthy. Archaeological work under the Baths of Caracalla have uncovered the remains of lavish villas complete with murals and mosaics. The Caelian is also the site of the Basilica of Santi Giovanni e Paolo and the ancient basilica of Santo Stefano Rotondo, known for its centralized, circular plan.