Nooshabad, known as Ouyi to locals, is an underground city with many passages and chambers in Isfahan Province in central Iran. It is one of the world's most remarkable underground cities and dates back to the pre-Islamic era.
The Burnt City in Eshtehard, a city in Alborz Province, [not to be confused with the Burnt City in southeastern Iran which is a UNESCO World Heritage Site] is home to manmade mountain dwellings which date back to 1000 years ago.