My Dad was actually able to walk up it and check it out when it was still allowed. I don't think they let anyone walk up it anymore.
The coolest thing you will read today. This is a fascinating story.
The History of the Mysterious Loretto Chapel Staircase
https://www.historydefined.net/loretto-chapel-staircase/
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Discussion
One of the things that wasn't mentioned is that it has no center support. Somehow the weight is transferred from top to bottom without it collapsing on itself.