The Twelve-Angled Stone – Cusco, Peru - Atlas Obscura
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Cusco, Peru

The Twelve-Angled Stone

This geometric feat is a testament to the Incas' mesmerizing architectural abilities. 

World-renowned for their master masonry skills, examples of the Incas’ architectural prowess can be found throughout South America. But there is no specimen that better showcases that expert craftsmanship than the “twelve-angled stone” found in downtown Cusco. 

Fashioned out of green diorite, the twelve-angled stone is part of the Lienzo Pétreo wall, an inward leaning wall that encircles the now-destroyed Palace of Hatunrumiyoc. Comprised of multiple massive stone blocks, the wall was built without the aid of mortar or any kind of binding material. Each block was cut to fit perfectly with every other surrounding block, requiring a painstaking amount of care and attention to detail. In fact, the joints of the wall are so precisely fashioned that even today, hundreds of years after it was first constructed, not even a single piece of paper can fit between any of the wall’s blocks.

While the entire wall is a sight to behold, the stone of twelve angles, so named for the twelve distinct cuts that form twelve corresponding joints, stands apart as the crown jewel of this geometric feat. It remains a popular attraction in the Peruvian city, and a longstanding testament to the Incas’ devotion to their craft. 

Know Before You Go

The twelve-angled stone is now part of a wall of the Archbishop's Palace and draws large crowds of curious visitors. As such, if you'd like to take your time to appreciate this marvel, it's best to visit as early in the day as possible.

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