The underground city of Ouyi (Noushabad) in northern Kashan, Isfahan Province, is considered one of the masterpieces of ancient architecture. The complex spreads across thousands of square meters and consists of many labyrinth-like architectural structures, corridors, rooms and wells. Natural air conditioning and water supply of the city are among its ancient engineering wonders. The ventilation system used in the underground city through devising canals made it possible for the refugees to breathe even at a depth of 20 meters below the ground.
A large number of historic evidence including earthenware vessels and stone instruments ranging in date to Sassanid (224-651 AD), Ilkhanid (1256-1336), and Safavid (1501-1736 AD) dynastic periods have been retrieved from the underground city. After three seasons of performing archeological studies, tourists can once again visit the city from entrances adjacent to two old water reservoirs.
In the past this region was quite insecure and by forming an underground chain of passages beneath the entire city, the inhabitants would shelter there in the time of being attacked. Through these passages they could reach any spot of the city without being seen.
The depth of this underground city varies from 4 to 18 meters. Entrances to the city were from population concentration points such as water reservoirs, markets, fortresses and also some individual houses. People could live in the underground passages and room for several days without the need of going outside.
There are three levels in this underground city and these levels were cleverly planned in a way that going to the different levels required moving from down to up. This made it easier for the people sheltering in the underground city to prevent enemies from getting to the upper levels.
Another interesting feature of their architecture was the curvy passages that made it possible for the inhabitants to ambush enemies. Furthermore there were several other tricks that were used to resist against the enemies, for instance digging deep holes in the middle of the rooms and covering it with rotating stones that would fall down if anyone stepped on them.
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Nushabad (Persian: نوش آباد, also Romanized Noshabad) is a city in the Central District of Aran va Bidgol County, Isfahan Province, Iran about 5 kilometers north of Kashan. At the 2006 census, its population was 10,476, in 2,859 families. As Nushabad city is located in the region of central desert of Iran, its weather is quite harsh. During the day Nushabad has a very hot temperature and during the nights it gets pretty cold.