A group of us will visit Florence soon. We want to climb to the top of il Duomo. We understand that this is a 463-step climb up a narrow, one-person-wide, one-way spiral staircase. Some of us are concerned that they might not be physically fit enough to complete the climb.
What happens if someone climbing the Duomo stairs gets tired and needs a rest? Or even can't continue? Are there wide spots in the route where one can rest? Or is this a big problem, such that people who think they can't complete the climb are better off not pushing the attempt?