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