line ▁which ▁features ▁many ▁of ▁the ▁tall est ▁buildings ▁in ▁the ▁world ▁as ▁well ▁as ▁the ▁Chicago ▁Land mark ▁Historic ▁Michigan ▁Bou lev ard ▁District . ▁Chicago ' s ▁sky line ▁is ▁spac ed ▁out ▁throughout ▁the ▁dow nt own ▁area . ▁The ▁Will is ▁Tower , ▁formerly ▁known ▁as ▁the ▁S ears ▁Tower , ▁the ▁second ▁tall est ▁building ▁in ▁the ▁Western ▁Hem is phere , ▁stands ▁in ▁the ▁western ▁Loop ▁in ▁the ▁heart ▁of ▁the ▁city ' s ▁financial ▁district , ▁along ▁with ▁other ▁buildings , ▁such ▁as ▁ 3 1 1 ▁South ▁W acker ▁Drive ▁and ▁the ▁AT & T ▁Corpor ate ▁Center . ▁ ▁Chicago ' s ▁third ▁tall est ▁building , ▁the ▁A on ▁Center , ▁is ▁located ▁just ▁south ▁of ▁Illinois ▁Center . ▁ ▁The ▁complex ▁is ▁at ▁the ▁east ▁end ▁of ▁the ▁Loop , ▁east ▁of ▁Michigan ▁Avenue . ▁Two ▁Pr ud ential ▁Pla za ▁is ▁also ▁located ▁here , ▁just ▁to ▁the ▁west ▁of ▁the ▁A on ▁Center . ▁ ▁The ▁Loop ▁contains ▁a ▁wealth ▁of ▁out door ▁sculpt ure , ▁including ▁works ▁by ▁Pablo ▁Pic asso , ▁Joan ▁Mir ó , ▁Henry ▁Moore , ▁Marc ▁Ch ag all , ▁Mag dal ena ▁Ab ak an ow icz , ▁Alexander ▁Cal der , ▁and ▁Jean ▁Dub uff et . ▁Chicago ' s ▁cultural ▁heavy we ights , ▁such ▁as ▁the ▁Art ▁Institute ▁of ▁Chicago , ▁the ▁Good man ▁Theatre , ▁the ▁Chicago ▁Theatre , ▁the ▁Ly ric ▁Opera ▁at ▁the ▁C iv ic ▁Opera ▁House