[ultimape]

I found a bunch of churches were built on ground that has been shown to contain soil bacteria with anti-biofilm properties. This means the 'holy ground' was literally able to heal wounds. Likewise, a lot of 'holy water' has similar healing properties because it often contained gold and silver nanoparticles.

The ritual use of these sites usually occurred afterwards once economic situation and custom solidified it as an area of rulership. Often cargo-cult'ing what would have been a genuine healing process.