▁in ▁from ▁the ▁Tu xt la ▁Mountains , ▁but ▁these ▁were ▁used ▁nearly ▁exclus ively ▁for ▁monuments ▁including ▁the ▁col oss al ▁heads , ▁the ▁" alt ars " ▁( act ually ▁thr ones ), ▁and ▁various ▁st ela e . ▁For ▁example , ▁the ▁bas alt ▁columns ▁that ▁surr ound ▁Complex ▁A ▁were ▁quar ried ▁from ▁P unta ▁R oca ▁Part ida , ▁on ▁the ▁G ulf ▁coast ▁north ▁of ▁the ▁San ▁And res ▁Tu xt la ▁vol cano . ▁“ L ittle ▁more ▁than ▁half ▁of ▁the ▁ancient ▁city ▁surv ived ▁modern ▁dist urban ces ▁enough ▁to ▁map ▁accur ately .” ▁Today , ▁the ▁entire ▁southern ▁end ▁of ▁the ▁site ▁is ▁covered ▁by ▁a ▁pet role um ▁ref in ery ▁and ▁has ▁been ▁largely ▁demol ished , ▁making ▁exc av ations ▁difficult ▁or ▁impossible . ▁Many ▁of ▁the ▁site ' s ▁monuments ▁are ▁now ▁on ▁display ▁in ▁the ▁arch ae ological ▁museum ▁and ▁park ▁in ▁the ▁city ▁of ▁Villa h erm osa , ▁Tab as co . ▁ ▁Major ▁features ▁of ▁La ▁V enta ▁ ▁La ▁V enta ▁was ▁a ▁civ ic ▁and ▁cer emon ial ▁center . ▁While ▁it ▁may ▁have ▁included ▁as - y et - und isc over ed ▁reg al ▁resid ences , ▁habit ation ▁for ▁the ▁non - reg al ▁el ite ▁and ▁the ▁common ers ▁were ▁located ▁at ▁out lying ▁sites ▁such ▁as ▁San ▁And rés . ▁Instead ▁of ▁dwell ings , ▁La ▁V enta ▁is ▁domin ated ▁by ▁a ▁restricted ▁sacred ▁area ▁( Comple