Machu Picchu, Urubamba Valley, S. Peru. Left wall of the House of the Altar, built of large regular monolithic slabs. The large slab on the left has a length of 3.16m., a height of 2.43m., and is 0.83m. thick.

From Josh Marcy's, Topher Wilkins' and Adam Tarnoff's ID1 paper.