The interior is truly stunning, a giant Alladin's cave covered with gold mosaics from the thirteenth century. The mosaics tell dozens of biblical stories, but since the stories climb up to the ceiling, they're entirely impossible to follow. The whole effect, down to the dim lighting and smoky atmosphere, is magical, but for the fact that the crowd control system here is deadening. There's only a narrow corridor where the crowds can funnel in and around the church, so it's impossible to explore on your own, and the whole experience is like being in a giant conga line. The four horses in the photo were ancient Roman sculptures that the Venetians stole from Constantinople in the thirteenth century, and are something like the city's mascots.