The Loretto Chapel’s spiral staircase, built without nails or central support, remains a 140-year-old mystery. Was it divine intervention, lost craftsmanship, or a miracle of engineering? 🏛️ 'SNL' ...

Since its construction completed in 1873, the Loretto Chapel in Santa Fe, New Mexico has captivated visitors from around the world, due in large part to the mystery surrounding its spiral staircase.