Florence is almost too beautiful. It is also very crowded. I've visited Florence twice, but on both occasions I failed to get into the Uffizi. The first time it was not yet possible to book a ticket online and I didn't feel like queuing for an hour and a half so I visited the Palazzo Pitti instead. The second time I could no longer get a ticket for the day and time I wanted. Maybe one day I'll get a third chance.