▁housing ▁projects ▁and ▁private ▁developers . ▁In ▁Q az vin , ▁none ▁are ▁functional ▁anymore . ▁However ▁ab ▁an bars ▁continue ▁to ▁be ▁used ▁in ▁some ▁areas ▁in ▁rural ▁Y az d ▁and ▁urban ▁N ae en . ▁Q an ats ▁are ▁mostly ▁used ▁in ▁rural ▁areas ▁and / or ▁for ▁agricult ure . ▁ ▁Ful ly ▁int act ▁surv iving ▁ab ▁an bars ▁of ▁Q az vin ▁in ▁order ▁of ▁capacity ▁ ▁Ex pl os ive ▁mig rat ory ▁tr ends ▁in ▁Iran ▁in ▁the ▁past ▁ 3 0 ▁years ▁have ▁led ▁to ▁a ▁wave ▁of ▁hast y ▁urban ization ▁inside ▁the ▁old ▁qu arters ▁of ▁ancient ▁cities , ▁destroy ing ▁their ▁original ▁fabric . ▁Some ▁fare ▁better ▁than ▁others ▁though . ▁Thus ▁for ▁example ▁when ▁comparing ▁Q az vin ▁to ▁Y az d , ▁Q az vin ▁has ▁fewer ▁surv iving ▁ab ▁an bars ▁despite ▁the ▁fact ▁that ▁Y az d ' s ▁ab ▁an bars ▁have ▁been ▁retired ▁for ▁much ▁longer ▁time ▁sp ans . ▁ ▁See ▁also ▁Ab ▁an bar ▁List ▁of ▁famous ▁ab ▁an bars ▁of ▁Q az vin ▁How z ▁Kar iz ▁Q an at ▁Y akh ch al ▁International ▁rank ings ▁of ▁Iran ▁Iran ian ▁architecture ▁San itation ▁of ▁the ▁Ind us ▁Valley ▁Civil ization ▁T eren ah ▁N ah raw an ▁Canal ▁ ▁References ▁ ▁Further ▁reading ▁Mem ari ▁e ▁Is l ami ▁e ▁Iran . ▁M . ▁K . ▁Pir nia . ▁ ▁Min ud ar ▁or ▁Bab ul jan ne . ▁Gul riz