The Duomo in Florence (aka the Basilica di Santa Maria del Fiore) is huge. Huge. If you’re in that area, you can get glimpses of the Duomo through fences, peaking over the tops of buildings… it occupies a massive amount of space. While the Duomo di Siena is breathtaking inside, one has to appreciate the external architecture of the outside. Here’s the Duomo 360, 24/7.