Tower Of Pigeons

Today I want to show you interesting bricklayer.I found this bricklayer at the core of the farm lands in one village.It's a big bricklayer with a great architecture.
In the past farmers made this building for pigeons,yes,for pigeons.
Pigeons lived in these towers and farmers took excrements them for farm lands as manure.In this picture you see lot of squares that pigeons lived in it.You can see squares because this wall had been ruined.

Nowadays,farmers don't use these bricklayers and they are dilapidated building.
In some of Isfahan villages you see like this building but I don't know in other Iranian villages people made like this building or not.
Or how about other villages in world?  
If you know ,will tell me,please.
Though,in Isfahan many people don't know  about towers but some of old farmers have a little information about past that they used these towers.