Jungle-shrouded Yaxchilán has a terrific setting above a horseshoe loop in the Río Usumacinta. The control this location gave it over river commerce, and a series of successful alliances and conquests, made Yaxchilán one of the most important Classic Maya cities in the Usumacinta region. Archaeologically, Yaxchilán is famed for its ornamented facades and roofcombs, and its impressive stone lintels carved with conquest and ceremonial scenes. A flashlight is helpful for exploring some parts of the site and last entry is at 3:30pm. Drinks are sold at a shack near the river landing. Howler monkeys (saraguates) inhabit the tall trees here, and are an evocative highlight. You’ll almost certainly hear their visceral roars, and you stand a good chance of seeing some. Spider monkeys, and occasionally red macaws, are also spotted here at times.