Snaps from inside a Safavid era pigeon house in Meybod, Yazd province of Iran.

As the name suggests, these were built to encourage pigeons to nestle inside the building - hence the myriad of alcoves through the multi-storey ribbed cylindrical building.

The phosphate rich droppings would be collected and used by farmers to fertilise their crops. Thankfully, this one is no longer used for that purpose - I can’t imagine much worse than being surrounded by thousands of these birds (read: winged rats) but it’s pretty ingenious and makes for some striking photos nonetheless.