Mortar? Incas made buildings last without it

Stone insets
Incas used “insert tab A into slot B” to hold stones piled on top of each other in place for years

Thursday, September 27, 2018, Cusco, Peru — How could the Incas build foundations that have outlasted the colonial buildings built on top of them? The Inca foundations were built with no mortar, just stones carved and placed on top of each other, surely not the most stable construction technique.

A visit to the Convent of Santo Domingo in Cusco answered those questions. The colonial church, started in 1534 on top of the Inca Temple of the Sun, fell down in the earthquake in 1950. That exposed the Inca foundation underneath. In a wise decision, the church opted for leaving the foundation open so the public could view them. Plus, they have a display that helps explain the Inca technique.

The stones look like they were just stacked on top of each other, but there is an “insert-tab-A-into-slot-B” going on. As our Alexander & Roberts guide, Yakelin, had already pointed out, the walls lean into one another to help support the entire structure during shaky times.

Leaning walls
Inca walls leaned into each other to provide stability

We also visited the Cathedral Basilica in Cusco’s main square. Mostly struck by a painting by Marcos Zapata in 1753 of the Last Supper. Right in the middle of the table is a prepared guinea pig ready for eating – an excellent demonstration of the Catholic’s church blending in with the native culture. Yakelin also pointed out that many people believe that Judas’ face is actually that of Francisco Pizarro. She also noted the halo over Christ. It’s not just a shining band perched over his head. It is a glow behind him, as if the sun were rising behind him. So what was Zapata worshiping?

         From https://medium.com/@julieshentonpeters