And then bird manages to pull itself together past this medieval tower -- one of the few remaining medieval towers -- towards the church of Sant'Agnese and around the dome looking down into Piazza Navona -- which we've already mentioned and seen and flown over a couple of times; there's the Bernini statue of the Four Rivers -- and then past the wonderful Borromini Sant'Ivo, stopping just long enough on the 26-foot diameter Oculus of the Pantheon to catch our breath.