▁North ▁Street ▁running ▁north . ▁▁ ▁Further ▁south ▁on ▁Main ▁Street ▁is ▁a ▁smaller ▁triangle ▁that ▁forms ▁the ▁split - tail ▁end ▁of ▁Old ▁S under land ▁Road ▁at ▁Main ▁Street . ▁In ▁this ▁tri angular ▁green ▁is ▁a ▁tall ▁sign - post ▁box ▁with ▁several ▁ 1 8 th - century ▁signs ▁giving ▁directions ▁to ▁nearby ▁towns , ▁one ▁of ▁which ▁is ▁pur port edly ▁fake . ▁ ▁Origin ally ▁the ▁entire ty ▁of ▁the ▁town , ▁splitting ▁off ▁from ▁S under land ▁in ▁ 1 7 5 2 , ▁Mont ague ▁Center ▁took ▁shape ▁in ▁the ▁ 1 9 th ▁century ▁as ▁the ▁site ▁of ▁an ▁early ▁gr ist mill ▁and ▁the ▁intersection ▁of ▁two ▁east - west ▁and ▁north - s outh ▁roads . ▁Main ▁Street ▁is ▁where ▁the ▁most ▁significant ▁buildings ▁in ▁the ▁village ▁lie , ▁along ▁with ▁North ▁and ▁Center ▁Stre ets , ▁which ▁line ▁the ▁town ▁common . ▁ ▁A ▁school ▁and ▁two ▁churches ▁from ▁the ▁ 1 8 3 0 s ▁fl ank ed ▁the ▁common , ▁as ▁did ▁the ▁ 1 8 5 8 ▁town ▁hall , ▁now ▁the ▁village ▁library . ▁ ▁The ▁oldest ▁building ▁in ▁the ▁district ▁is ▁the ▁Root ▁Ta vern ▁that ▁dates ▁to ▁about ▁ 1 7 3 4 , ▁now ▁a ▁home . ▁ ▁The ▁district ▁also ▁includes ▁the ▁Al v ah ▁Stone ▁Mill , ▁now ▁known ▁as ▁the ▁Book mill , ▁separately ▁listed ▁on ▁the ▁National ▁Register ; ▁it ▁is ▁located ▁on ▁the ▁S aw ▁Mill ▁River . ▁