ever idge ▁considered ▁D ù n ▁Fou lag ▁to ▁be ▁a ▁d un ▁and ▁thought ▁he ▁found ▁evidence ▁of ▁a ▁def ensive ▁wall . ▁The ▁current ▁opinion , ▁however , ▁is ▁that ▁it ▁is ▁just ▁a ▁naturally ▁rock y ▁kn oll . ▁This ▁once ▁supposed ▁d un ▁was ▁visited ▁in ▁ 1 9 7 2 ▁by ▁the ▁Or dn ance ▁Survey ▁( OS ) ▁who ▁could ▁find ▁no ▁trace ▁of ▁anti qu ity ▁on ▁site ; ▁and ▁currently ▁the ▁Royal ▁Commission ▁on ▁the ▁An cient ▁and ▁Historical ▁Mon uments ▁of ▁Scotland ▁( R CA H MS ) ▁class ifies ▁it ▁a ▁' natural ▁feature '. ▁What ▁B ever idge ▁thought ▁was ▁a ▁def ensive ▁wall ▁is ▁now ▁considered ▁to ▁be ▁the ▁remains ▁of ▁a ▁modern ▁building ; ▁what ▁he ▁thought ▁were ▁" f allen ▁stones " ▁are ▁only ▁beach ▁stones . ▁ ▁Tra ces ▁of ▁the ▁fort ▁are ▁visible ▁on ▁a ▁rock y ▁b oss , ▁which ▁reaches ▁ ▁above ▁the ▁surrounding ▁ground . ▁Three ▁sides ▁of ▁this ▁cl iff ▁are ▁extremely ▁she er ; ▁in ▁some ▁places ▁all ▁the ▁way , ▁, ▁to ▁the ▁ground ▁below . ▁The ▁rock ▁is ▁in access ible ▁on ▁these ▁three ▁sides ; ▁although ▁it ▁is ▁accessible ▁from ▁the ▁north ▁over ▁a ▁natural ▁terra ce . ▁This ▁terra ce ▁is ▁a ▁narrow ▁sh elf ▁which ▁asc ends ▁around ▁the ▁cl iff - face ▁to ▁on ▁the ▁north - west ▁of ▁the ▁cl iff . ▁ ▁The ▁fort ' s ▁main ▁wall ▁occupied ▁the ▁cr est ▁of ▁a