ist ▁Mill ▁Historic ▁District ▁is ▁a ▁ ▁par cel ▁of ▁High lands ▁Country ▁Club ▁located ▁at ▁the ▁south west ▁corner ▁of ▁the ▁intersection ▁of ▁NY ▁ 9 D ▁and ▁Lower ▁Station ▁Road ▁( Put nam ▁County ▁Route ▁ 1 2 ) ▁in ▁G arrison , ▁New ▁York , ▁United ▁States . ▁It ▁contains ▁three ▁buildings , ▁including ▁the ▁tit ular ▁gr ist mill ▁( bel ieved ▁to ▁be ▁one ▁of ▁the ▁oldest ▁in ▁the ▁county , ▁and ▁a ▁dam , ▁all ▁d ating ▁to ▁the ▁colonial ▁era ▁or ▁the ▁early ▁years ▁of ▁American ▁independence . ▁They ▁are ▁inter sp ers ed ▁within ▁the ▁club ' s ▁golf ▁course , ▁and ▁actually ▁come ▁under ▁the ▁ownership ▁of ▁the ▁Open ▁Space ▁Institute . ▁ ▁Little ▁is ▁known ▁about ▁who ▁built ▁the ▁structures , ▁and ▁when . ▁Their ▁architecture ▁suggests ▁they ▁are ▁among ▁the ▁oldest ▁buildings ▁in ▁G arrison , ▁some ▁of ▁the ▁few ▁ext ant ▁examples ▁of ▁vern ac ular ▁architecture ▁in ▁the ▁ham let . ▁They ▁were ▁added ▁to ▁the ▁National ▁Register ▁of ▁Historic ▁Places ▁( NR HP ) ▁as ▁a ▁historic ▁district ▁in ▁ 1 9 9 2 . ▁ ▁Geography ▁and ▁properties ▁The ▁district ▁is ▁bounded ▁on ▁the ▁east ▁by ▁Route ▁ 9 D , ▁the ▁north ▁by ▁Lower ▁Station ▁Road , ▁the ▁south ▁by ▁Ar den ▁Brook ▁and ▁the ▁west ▁by ▁a ▁d irt ▁path ▁that ▁goes ▁from ▁Lower ▁Station ▁to ▁the ▁bro ok . ▁Other ▁NR HP - list ed ▁properties ▁are ▁nearby : ▁The ▁Bir ches ▁is ▁across ▁