Prague Old Town Square absolutely must be visited before sunrise — no crowds, the light on the Astronomical Clock is completely different — I have 200 reference photos saved!!
Sunrise is around 5:30-6:00am. The square is essentially empty. That angle of light is something the afternoon tourist rush will never show you. By 8 or 9am it's a crowd again — different experience entirely.
My itinerary: arrive afternoon day one, adjust for time zone, 5am departure on day two to the square, then Kafka Museum mid-morning, then standard sightseeing. I've revised this plan seven times. Not there yet — but fully prepared haha. Anyone who's been, any tips?