Under ground city Nush abad (Oui)

The underground city of Nushabad, known as Ouyi to locals is located 8 km north of Kashan in Esfahan province, central Iran. It's a truly fascinating ancient place. Nushabad underground city is considered to be one of the most remarkable underground cities in the world and a masterpiece of ancient architecture.

There is also a  reason why the city is called Nushabad  ("city of cold tasty water"). In ancient times, one of the Sassanian kings was passing through tge area and stopped to drink water from a well. As this water extremely clear and cold, the ordered to build a city around the well and name it Anoushabad which eventually became known as Nushabad.

Historical evidence indicates that Nushabad was mainly used as a shelter by people during the Mongol invasion in Iran in the 13th century and remained in use in emergency cases until late Qajar dynastic period (1787-1921).