Chiesa di Sant'Ignazio di Loyola

This guide to the Chiesa di Sant'Ignazio di Loyola in Rome centers on the disc set into the nave floor, the one spot from which the painted ceiling above reads as a soaring dome. It traces the story back to 1642, when the Jesuits ran out of money for a real dome and left the crossing bare for over forty years, until lay brother Andrea Pozzo arrived with an obsession for the mathematics of perspective. You'll hear how quickly he worked. Try standing on and off that marked spot before you move on.