Adjacent to the Campidoglio square, this Basilica became the centre for religious and civic life in the city during the 14th century. The architect claimed climbing the daunting 124 step staircase leading to the main entrance on one's knees would absolve a Catholic of all sins. Lord knows, I'd rather have murder on my knees than on my hands.
Some historians postulate the Basilica was built atop the ruins of Juno's temple. I have a feeling there's more to this building than meets the eye so I'd suggest paying close attention to this one.