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spiral staircase marble master piece torre menagem access indoor stairway stairwell helix helical moving stonework steps rotate swirl perspective circular infinity window beja city alentejo region portugal travel landmark gothic fortress castle medieval middle ages 13th century narrow winding geometric caracole turnpike cochlea cockle corkscrew ascensorium mathematical fixed radius curve central pole screwsymmetrically space small footprint steep heritage military architecture jul 27th 2023: baixo portugal emblematic monument