Streetview Paintoff, in which Rome is the subject city. I chose the Pantheon because it is one of the most amazing buildings I've ever visited. It has a concrete dome with a large opening in it (an oculus), and rain does come in, but drains through a system in the floor. The artist Raphael is entombed there (and his baby angels live on, on coffee cups everywhere). How they figured out how to build something so spectacular in 126 AD is just beyond me.