It has been some kind of underground shelter. they took refuge there when they have been under attacks. The source explains they built it to scape from Mongols Raids.
When you do not have mountains such as the Hindu-Kush in Afganistan to hide,then the only place to save yourself from the Horde is underground.
"There are worse crimes than burning books. One of them is not reading them. "
--- Joseph Alexandrovitch Brodsky, 1991, Russian-American poet, b. St. Petersburg and exiled 1972 (1940-1996)
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