Oro,
Only the ones used by the Church.
Concrete has been around since Roman times. I've found very old Spanish structures with a very dirt like crumbly cement and it looked like they used powers left over from some sort of milling for the mortar possibly mining. I believe there were small Mission / Hacienda's that used monies from Spanish mining conglomerates to build these structures closer to mining.
These were also centers for the slavery they imposed and probably destroyed by uprisings and attacks.
There have been these types of structures found in and around the Catalina mountains and documented I have a few of them from the Arizona State Museum I'll show.
This first one talks about earlier pit dwellings and Spanish center court type dwelling made from Rocks
and a mud mixed mortar. It's hard to read but well worth reading.
This is one of Don Pages papers.
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This next one is about the lost Mission itself and the History surrounding it.
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