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The building as it stands today is the result of a series of building works and restoration attempts executed over the centuries with the primary aim of reducing the risk of collapse resulting from the inclination. It is formed by a cylindrical body of masonry encircled by arcades with arches and columns resting upon the base, surmounted by a belfry. The central body of the structure is composed of a hollow cylinder, formed by an external wall facing of shaped ashlars in white and grey San Giuliano limestone, an inner wall facing also of worked limestone and, between these two wall facings, an annular masonry area. Within this masonry area is a spiral stair, which, with 293 steps, climbs up to the sixth arcade, where the internal well terminates in a vault with a central aperture for the passage of light, allowing access to the belfry above and, in the lower intermediate areas, to the various arcades.
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Western Europe
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