ritt ▁Island , ▁Florida , ▁United ▁States . ▁The ▁five - story ▁structure ▁is ▁in ▁the ▁Indust rial ▁Area ▁of ▁NASA ' s ▁Kennedy ▁Space ▁Center . ▁Its ▁facilities ▁include ▁the ▁crew ▁quarter ▁d orm itories ▁for ▁astr onaut s , ▁and ▁suit - up ▁prepar ations ▁prior ▁to ▁their ▁fl ights . ▁The ▁other ▁facility ▁is ▁a ▁large ▁space craft ▁work shop ▁used ▁for ▁manufact uring ▁and ▁checking ▁activities ▁on ▁cre wed ▁space craft . ▁On ▁January ▁ 2 1 , ▁ 2 0 0 0 , ▁it ▁was ▁added ▁to ▁the ▁U . S . ▁National ▁Register ▁of ▁Historic ▁Places . ▁ ▁Apol lo ▁program ▁When ▁it ▁was ▁originally ▁built ▁in ▁ 1 9 6 4 ▁to ▁process ▁space craft ▁in ▁the ▁Gem ini ▁and ▁Apol lo ▁era , ▁it ▁was ▁known ▁as ▁the ▁Mann ed ▁Space craft ▁Oper ations ▁Building . ▁It ▁was ▁renamed ▁the ▁Oper ations ▁and ▁Check out ▁Building ▁during ▁the ▁Apol lo ▁program , ▁known ▁inform ally ▁as ▁the ▁O & C . ▁ ▁Alt itude ▁test ▁ch amb ers ▁ ▁In ▁ 1 9 6 5 , ▁a ▁pair ▁of ▁alt itude ▁ch amb ers ▁were ▁installed ▁in ▁the ▁High ▁Bay ▁for ▁testing ▁the ▁environmental ▁and ▁life ▁support ▁systems ▁of ▁both ▁the ▁Apol lo ▁Command / Service ▁Module ▁and ▁L un ar ▁Module ▁at ▁sim ulated ▁alt itudes ▁of ▁up ▁to ▁. ▁Each ▁chamber ▁is ▁ ▁high ▁( with ▁a ▁clear ▁working ▁height ▁of ▁) ▁and ▁an ▁interior ▁diameter ▁of ▁, ▁were ▁human - r ated