Chiesa di San Marcello al Corso
The church of San Marcello al Corso, dedicated to Pope Marcel I, was built in its present form in 1592 and its concave façade was completed by Carlo Fontana in 1683. The church has existed since the 4th century and is said to have been built on the site of the prison where Pope Marcel I (308-309) died. In the 8th century, Pope Adrian I (772-795) had a church built on the same site, which is now under the modern church.