A marvelous staircase.
The Loretto chapel is located in the city of Santa Fe, New Mexico (USA). Built in 1872, the chapel is best known for its marvelous staircase, a true masterpiece of architecture from 1887. The spiral staircase makes two full revolutions and has no nails or center support, nor is it attached to the wall. Sadly, the name of the designer of this staircase is unknown!