, ▁concrete ▁building , ▁it ▁is ▁almost ▁entirely ▁under ground ▁( part ▁of ▁the ▁building ▁lies ▁beneath ▁the ▁Bou lev ard ▁P ère ▁R ém i ▁S emp é ▁above ). ▁ ▁Dim ensions ▁and ▁capacity ▁The ▁Bas il ica ▁was ▁designed ▁by ▁the ▁architect ▁Pierre ▁V ago . ▁The ▁nave ▁is ▁o val , ▁ ▁long ▁and ▁ ▁wide , ▁and ▁s lop es ▁g ently ▁up wards ▁from ▁the ▁centre , ▁where ▁the ▁san ctu ary ▁is ▁situated ▁on ▁a ▁raised ▁platform . ▁The ▁ce iling ▁is ▁low , ▁at ▁only ▁ ▁high , ▁and ▁is ▁supported ▁by ▁ 5 8 ▁pre - str essed ▁concrete ▁pill ars ▁which ▁meet ▁ 2 9 ▁concrete ▁be ams ▁which ▁cross ▁the ▁ce iling , ▁giving ▁it ▁the ▁impression ▁of ▁an ▁u pt urn ed ▁ship . ▁This ▁design ▁creates ▁a ▁very ▁large ▁open ▁space , ▁of ▁, ▁for ▁maximum ▁visibility ▁from ▁any ▁part ▁of ▁the ▁nave . ▁When ▁full ▁it ▁can ▁accommod ate ▁up ▁to ▁ 2 5 , 0 0 0 ▁wor sh ipp ers . ▁ ▁Inter ior ▁decor ation ▁On ▁the ▁walls ▁there ▁are ▁ 5 2 ▁images ▁in ▁the ▁gem mail ▁style ▁of ▁over la pping ▁st ained ▁glass . ▁ ▁On ▁the ▁west ▁r amp ▁are ▁the ▁ 1 5 ▁traditional ▁Myst eries ▁of ▁the ▁Ros ary , ▁and ▁on ▁the ▁east ▁r amp ▁are ▁the ▁St ations ▁of ▁the ▁Cross , ▁designed ▁by ▁Den ys ▁de ▁Sol ère . ▁On ▁the ▁lower ▁part ▁of ▁the ▁east ▁side