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A stone piling in the Usumacinta River is thought to have been either the base for a dock, or for a bridge that crossed the river.
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.