Existing comment:
Design:
Each of the staircases has 136 steps that complete seven spirals while ascending five stories from the basement to the third floor. The cantilevered design of the staircases eliminates the need for a central support as each step is anchored into the marble wall on one end and rests upon the step below it. The staircases, therefore, are held in place by fit and pressure rather than mortar and steel. |