Oxlahuntun
Mexico
Oxlahuntun is an archaeological Maya site located in the Lacandon Jungle of Mexico that includes an ancient ruined Maya city embedded and hidden in the thick tropical jungle of Chiapas integrated by a main palace, numerous pyramid temples and carved stone monuments with Maya glyphs, the rest of the buildings are buried deep in the jungle.
Archaeological site data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).