Upon exiting the Vatican Museums, visitors have the opportunity to wind their way down the impressive 1930s double-helix staircase designed by Guiseppe Momo, but don’t mistake these steps for the iconic Bramante Staircase of 1512, designed by the innovative Donato Bramante, who lays claim to an immense amount of the Vatican's architecture. This set spins down and out of the Pio-Clementine Museum. This staircase is only visited by tourists on specialized tours through the Vatican and served as the inspiration for the more visible Vatican Museums steps.
The Bramante Staircase was designed in the architectural style known as the double-helix, which essentially means there are two layers to the stairs, allowing people to go upwards without meeting those walking down the stairs, and vice-versa. The design is best compared to a strand of DNA, with two layers of twisting spirals layered on top of one another, and commissioned by Pope Julius the Second, the original purpose of the Bramante Staircase was to connect the Belvedere Palace to the city of Rome below.