Even stranger than Strange Towers of the Third Reich, these terracotta-colored (favorite pigeon color) structures dot Iranian landscape, some more than 20 meters high.
Little wonder then that the designs for even the most ignoble of buildings - a pigeon house - strike viewer as wonderful and intricate. The greatest number of these are found in and around the city of Isfahan (some are round, and some are square)
There were thousands of these buildings during the Safavid dynasty, about the 16th century CE. They were built to collect the droppings as fertilizer for melon and cucumber fields... However, in modern times chemically produced fertilizers have drastically reduced the viability of the bird guano industry and as a result not many of these structures have survived to the present day. The droppings were also used in the process of tanning leather.
Each pigeon sat in a neat cubicle (or a "capsule hotel" room, single occupancy) - hundreds of them swirling up in a dazzling geometric pattern.
The elaborate corridors and stairways, many floors and even more levels can make you easily feel lost.
First pigeon towers were built in ancient Egypt, and today pigeon houses can be found all over Europe and even in North America, although in these cases the birds are kept as a hobby or for racing.
Some Ancient Egyptian Towers: This is Not a Tomb! -
In England they are known as dovecotes or columbaria, from the Latin name of the pigeon family. English dovecotes were connected with a large estate or manor and were a symbol of status - the greater the land of the estate, the bigger the structure could be. This pegion tower is near Bruges, Belgium (15th century).