Loretto Chapel Staircase, Santa Fe, NM A masterpiece—and mystery—of woodworking, this spiral structure is entirely self-supporting, without any central column to provide stability and with wooden pegs instead of nails.
Loretto Chapel, Santa Fe,Some consider the staircase in the Loretto Chapel to be a miracle. How else can you account for a staircase with two 360 degree turns and no observable methods of support?
https://flic.kr/p/E5KENK | Stairway from Heaven | A Stairway from Heaven? Loretto Chapel Staircase [a winding choir loft staircase in the shape of a helix]. - Loretto Chapel in Downtown Santa Fe, New Mexico. Built in 1873.