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The largest of the site's 3 acropolis is the Great Acropolis, which was built in parallel to the west bank of the Usumacinta River. Anthropologists believe it was either a royal palace or a residential structure for the city's elite. Two other acropolises are atop the south and the west hill.
Built by King Shield Jaguar I, a series of lintels portrays the king's various military adventures and victories.
Built by King Bird Jaguar IV, a central lintel portrays the king while adjacent lintels portray his captains and priests.
Structure 19 has a series of underground corridors beneath it, most leading to various small basement rooms, but one of the corridors remains sealed and unexplored. There are bats and some pretty cool bugs living inside.