Originally a pagan temple dedicated to 'all the gods', the Church of Santa Maria Rotonda or Santa Maria ad Martyres was dedicated in 609 A.D. It has been a Catholic church for over 1,400 years. On Pentecost Sunday parishioners drop rose petals through the 27-foot ocular opening above (see the video below). Kings and queens are entombed there, as is the great artist Raphael. Go here, here, and here for more fascinating information on the history of this sacred structure. For another view, watch this, too.