est nut ▁Hill ▁neighborhood ▁of ▁Philadelphia , ▁Pennsylvania . ▁ ▁Dru im ▁Mo ir ▁was ▁added ▁to ▁the ▁National ▁Register ▁of ▁Historic ▁Places ▁in ▁ 1 9 7 9 . ▁It ▁is ▁a ▁contrib uting ▁property ▁of ▁the ▁Ch est nut ▁Hill ▁National ▁Historic ▁District . ▁ ▁" D ru im ▁Mo ir " ▁means ▁Great ▁R idge ▁in ▁Scottish ▁G ael ic . ▁ ▁Cont rib uting ▁properties ▁The ▁center pie ce ▁of ▁the ▁historic ▁district ▁is ▁Dru im ▁Mo ir ▁Castle ▁( 1 8 8 5 – 8 6 ), ▁whose ▁main ▁gate ▁is ▁at ▁the ▁corner ▁of ▁Will ow ▁Gro ve ▁Avenue ▁and ▁Ch ero kee ▁Street . ▁Design ed ▁by ▁architect s ▁G . ▁W . ▁& ▁W . ▁D . ▁H ew itt , ▁and ▁built ▁at ▁a ▁cost ▁of ▁over ▁$ 1 1 5 , 0 0 0 ▁for ▁Henry ▁H . ▁Houston , ▁the ▁thirty - room ▁home ▁was ▁the ▁largest ▁in ▁its ▁neighborhood . ▁▁ ▁Local ▁W iss ah ick on ▁sch ist ▁was ▁used ▁for ▁the ▁walls , ▁Eastern ▁gran ite ▁for ▁the ▁trim , ▁and ▁sl ate ▁for ▁the ▁roof . ▁The ▁interior ▁is ▁notable ▁for ▁its ▁variety ▁of ▁woods : ▁o ak ▁for ▁the ▁hall ▁and ▁st air way , ▁but tern ut ▁wal nut ▁for ▁the ▁par lor , ▁ma h og any ▁for ▁the ▁reception ▁room , ▁quarter ed ▁o ak ▁in ▁the ▁d ining ▁room ▁and ▁library , ▁sy cam ore ▁for ▁the ▁office , ▁and ▁cy press ▁for