The Loretto Chapel, in Santa Fe, New Mexico, is a former Roman Catholic church that is now used as a museum and wedding chapel.  It was built between 1873 and 1878.

It is known for its unusual helix shaped spiral staircase (the "Miraculous Stair"). The staircase has two 360 degree turns and no visible means of support. Also, it is said that the staircase was built without nails—only wooden pegs. The stairs are now considered too unsafe for regular use. For more information, refer to the Loretto Chapel website.