Merv was sacked by the Mongols.
Several cities existed on this site.
The site of Ancient Merv has been listed by the UNESCO as one of the World Heritage Sites.
... household size is 2.59 and the average family size is 3.04. In the town the population is spread out with 25.2% under the age of 18, 4.8% from 18 to 24, 27.3% from 25 ...