The church of San Nicola in Carcere (St Nicholas in Prison) is built into the remains of three ancient temples, which stood in what was once the Forum Holitorium (Vegetable Market).
The church covers the middle temple completely and incorporates the lateral colonnade of the temple on each side. The temples, which date back to the first century BCE and the first century CE, were dedicated to Janus, Spes (Hope) and Juno Sospita (the Saviour).
In 1599 San Nicola in Carcere was remodelled by Giacomo della Porta (1532-1602), who added a new facade. The church's bell tower, which was originally a fortified tower belonging to the Pierleone family, was left unchanged.