I have climbed a lighthouse using stairs, and what I just did was a
lot like it. I climbed St.Peter's dome today and it has 517 stairs. It
was hard work! First, we just climbed some stairs (204 of them) until
we got to the roof of the church. Then the staircase got thinner. Then
they got very thin. Then we got to the top. We looked at the view for
a while, then (finally) we went back down.