Stunning Mosaics and Architecture
The basilica is absolutely beautiful inside. The byzantine mosaics covering the interior are so intricate, it's hard to imagine the patience and skills that go into building such a place over several centuries. It is worth the admission to go upstairs. Not only do you get a much better view of the mosaics, you also get access to the outside loggia (balcony) where the bronze horses are located. The view of Piazza San Marcos from here is stunning, make sure you have your camera. Highly recommended.