The Loretto Chapel is popular for weddings, but if you're not planning one at the moment, visit anyway. Loretto Chapel is famous for a completely different reason: the Miraculous Staircase. Subject of articles, TV specials, even movies, the Miraculous Staircase has two 360 degree turns and no visible means of support. It's also built entirely without nails . . . just wooden pegs. This, and the fascinating story behind it's construction, is what makes Loretto Chapel famous.