▁fort : ▁inside ▁the ▁wall ▁were ▁straight ▁roads ▁which ▁crossed , ▁a ▁headquarters ▁building ▁( the ▁Pra et or ium ), ▁the ▁command ant ' s ▁house , ▁a ▁set ▁of ▁bar rack ▁blocks ▁for ▁the ▁coh ort ▁of ▁auxili ary ▁soldiers , ▁and ▁gran aries ▁to ▁store ▁food . ▁Also ▁as ▁usual , ▁there ▁was ▁a ▁bath ▁house ▁and ▁a ▁temple ▁( ded ic ated ▁by ▁the ▁auxili aries ▁to ▁the ▁Emperor ▁Car ac alla ) ▁outside ▁the ▁wall . ▁There ▁was ▁an ▁alt ar ▁to ▁M ith ras ▁and ▁another , ▁as ▁already ▁mentioned , ▁to ▁Her cules . ▁ ▁Ep iac um , ▁however , ▁has ▁two ▁unique ▁features . ▁First , ▁the ▁fort ' s ▁military ▁engine ers ▁modified ▁the ▁usual ▁rect angular ▁plan ▁to ▁suit ▁the ▁available ▁site : ▁it ▁is ▁dist orted ▁into ▁a ▁lo zen ge ▁or ▁par alle lo gram ; ▁the ▁internal ▁features ▁of ▁the ▁fort ▁are ▁similarly ▁dist orted . ▁Six ▁bar ra cks ▁were ▁however ▁fitted ▁in ▁behind ▁the ▁headquarters ▁building ▁( pr inci p ia ), ▁and ▁four ▁in ▁front ▁of ▁it , ▁in ▁a ▁limited ▁area ▁of ▁. ▁Second , ▁the ▁wall ▁is ▁surrounded ▁by ▁four ▁ste ep ▁def ensive ▁d itch es ▁and ▁banks ▁around ▁the ▁hill ▁sp ur , ▁and ▁seven ▁such ▁r amp arts ▁across ▁the ▁u ph ill ▁side ▁of ▁the ▁sp ur . ▁These ▁const itute ▁the ▁most ▁complex ▁def ensive ▁earth works ▁of ▁any ▁known ▁Roman ▁fort , ▁with ▁multiple ▁banks ▁and ▁d itch