I don't know if it's an inch and a half or two or more... That's all the walls are, it's just a big shell of copper. It's sweltering inside because of that, between the copper catching all that sun and the breathing of all the tourists, it's like a sauna. And it's a single length spiral staircase going all the way to the top, so basically it's a long slow crawl, and no pausing so you just basically go to the crown walk the inside of that, then then go back down. People used to be able to go to the torch too, but it started weakening, so they closed that off ages ago.
I don't know how things are with upgrades and whatnot, I did the standard school trip thing once before the refurbishing. But I do believe they really couldn't do much to expand the staircase, so it's still a slow walk.
