CO ▁World ▁Heritage ▁Convention , ▁established ▁in ▁ 1 9 7 2 . ▁Mexico ▁accepted ▁the ▁convention ▁on ▁ 2 3 ▁February ▁ 1 9 8 4 , ▁making ▁its ▁historical ▁sites ▁el ig ible ▁for ▁inclusion ▁on ▁the ▁list . ▁As ▁of ▁ 2 0 1 8 , ▁there ▁are ▁thirty - five ▁World ▁Heritage ▁S ites ▁in ▁Mexico , ▁including ▁twenty - se ven ▁cultural ▁sites , ▁six ▁natural ▁sites ▁and ▁two ▁mixed ▁sites . ▁The ▁country ▁ranks ▁first ▁in ▁the ▁Amer icas ▁and ▁sevent h ▁world wide ▁by ▁number ▁of ▁Heritage ▁sites . ▁ ▁Mexico ' s ▁first ▁six ▁sites , ▁S ian ▁Ka ' an , ▁Pre - H is pan ic ▁City ▁and ▁National ▁Park ▁of ▁Pal en que , ▁Historic ▁Centre ▁of ▁Mexico ▁City ▁and ▁X och im il co , ▁Pre - H is pan ic ▁City ▁of ▁Te ot ih u ac an , ▁Historic ▁Centre ▁of ▁O ax aca ▁and ▁Arch ae ological ▁site ▁of ▁Monte ▁Alb án , ▁and ▁Historic ▁Centre ▁of ▁P ue bla , ▁were ▁ins cribed ▁on ▁the ▁list ▁at ▁the ▁ 1 1 th ▁Session ▁of ▁the ▁World ▁Heritage ▁Committee , ▁held ▁at ▁UN ES CO ▁headquarters ▁in ▁Paris , ▁France ▁in ▁ 1 9 8 7 . ▁ ▁In ▁addition ▁to ▁its ▁ins cribed ▁sites , ▁Mexico ▁also ▁maintain s ▁twenty - one ▁properties ▁on ▁its ▁tent ative ▁list , ▁considered ▁for ▁future ▁nom ination . ▁ ▁There ▁are ▁also ▁ 9 ▁trad itions ▁and ▁celebr ations ▁which