aka Heat Activated Scented Architecture
This is a real photo by Mohammad Domiri
The mortar of mosques was mixed with musk and other aromatics so that during the hottest part of the day, when the entire building was warm to the touch, they would exude their hidden olfactory treasures upon the worshipers inside.
I first read this on Perfume Shrine, the most important perfume blog out there. I was a little upset, in fact, that I had never heard of this in all my years of formal study of architecture.
Cultural Perception of Musk