Well, for 1900 years old the Pantheon is in pretty good shape. It started off as a pagan temple, and was converted to a Christian church in 609 AD, to save it from being destroyed. It is also the tomb of a few people such as the painter Raphael (not the turtle), a few kings of Italy and the violinist Corelli.
As in the rest of Rome the crowds were a pain, though I recognise I was part of that crowd and probably a pain to someone else. Luckily I was able to get a 2 second exposure, which blurred a few people into insignificant wisps or blurs, so I was a little happier.