Detail of a spiral staircase in the Leaning Tower of Pisa, Italy

Spiral staircase crafted from stone, featuring tightly packed steps coiling around a central column. The stone surfaces are smooth with varied light and dark tones, displaying a timeworn, historic appearance. The circular design draws the eye inward, highlighting the craftsmanship involved in constructing such a confined, yet elegant architectural feature. The geometry of the stairs suggests careful engineering, typical of historic towers.