‘Basilica Papale di San Pietro in Vaticano’, the Papal Basilica of St. Peter in Rome, Italy by Donato Bramante, Michelangelo Buonarotti, Gianlorenzo Bernini, et al.
Here it is, the big mack daddy of all Christian churches. It didn’t impress me nearly as much as the Pantheon. I think it had to do with the way in which you enter and experience the building; like cattle. St. Peter’s has to deal with so many tourists every day that even simply getting through the front door is a huge airport-TSA-line-like affair. Once you are inside it’s fine, and you’re free to explore, but the procession they’ve set up is hell in the Italian sun. I spent most of my time inside gawking at Michelangelo’s Pietà than actually looking at the building.