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The spiral stair is a type of stairway which, due to its complex helical structure, has been introduced relatively late into architecture. Although the oldest example dates back to the 5th century BC, [ 1 ] it was only in the wake of the influential design of the Trajan's Column that this space-saving new type permanently caught hold in ancient ...
Even the fixtures of the original wooden stairways are frequently still visible. In several cases, elevated entranceways built in the Late Middle Ages or Early Modern times were accessed by staircase towers with spiral staircases. Occasionally an elevated entrance was also guarded by a small drawbridge. Wooden stairways were often protected ...
Further, the spiral stairs and the multi-storey ramps ascend in both concord and contrast of one other, [7] as the tilted plane of the ramp connects various levels in an uninterrupted path, concluding outside at a curved solarium situated above the terrace. [9]
A new door was formed from an existing window and a permanent stone stair constructed. The tower is 11m, in height, and around 9m in diameter, tapering slightly to the top. A corbelled parapet forms the top of the walls, with a gabled caphouse covering the spiral stair, which is within the 1.8m thick wall.
The double-spiral staircase One of the architectural highlights is the spectacular open double-spiral staircase that is the centrepiece of the château. [ 1 ] The two spirals ascend the three floors without ever meeting, illuminated from above by a sort of light house at the highest point of the château.
The interior of Trajan's Column is hollow: entered by a small doorway at one side of the base, a spiral stair of 185 steps gives access to the platform above, having offered the visitor in antiquity a view over the surrounding Trajan's forum; 43 window slits illuminate the ascent. [25]
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