▁John ▁Wood . ▁But ▁all ▁is ▁not ▁what ▁it ▁seems ; ▁while ▁Wood ▁designed ▁the ▁great ▁cur ved ▁fa ç ade ▁of ▁what ▁appears ▁to ▁be ▁about ▁ 3 0 ▁houses ▁with ▁I onic ▁columns ▁on ▁a ▁rust ic ated ▁ground ▁floor , ▁that ▁was ▁the ▁extent ▁of ▁his ▁input . ▁Each ▁purch aser ▁bought ▁a ▁certain ▁length ▁of ▁the ▁fa ç ade , ▁and ▁then ▁employed ▁their ▁own ▁architect ▁to ▁build ▁a ▁house ▁to ▁their ▁own ▁specific ations ▁behind ▁it ; ▁hence ▁what ▁appears ▁to ▁be ▁two ▁houses ▁is ▁sometimes ▁one . ▁This ▁system ▁of ▁town ▁planning ▁is ▁bet rayed ▁at ▁the ▁rear ▁of ▁the ▁cres cent : ▁while ▁the ▁front ▁is ▁completely ▁uniform ▁and ▁symmet rical , ▁the ▁rear ▁is ▁a ▁mixture ▁of ▁differ ing ▁roof ▁height s , ▁ju xt ap os itions ▁and ▁fen estr ation . ▁This ▁" Que en ▁Anne ▁front s ▁and ▁Mary - An ne ▁back s " ▁architecture ▁occurs ▁repeatedly ▁in ▁Bath . ▁ ▁In ▁front ▁of ▁the ▁Royal ▁C res cent ▁is ▁a ▁Ha - ha , ▁a ▁tren ch ▁on ▁which ▁the ▁inner ▁side ▁of ▁which ▁is ▁vertical ▁and ▁faced ▁with ▁stone , ▁with ▁the ▁outer ▁face ▁s loped ▁and ▁tur f ed , ▁making ▁the ▁tren ch , ▁in ▁effect , ▁a ▁sun ken ▁f ence ▁or ▁retain ing ▁wall . ▁The ▁ha - ha ▁is ▁designed ▁not ▁to ▁interrupt ▁the ▁view ▁from ▁Royal ▁Victoria ▁Park , ▁and ▁to ▁be ▁invisible ▁until ▁seen ▁from ▁close ▁by . ▁ ▁The ▁other ▁cres