The jungle is also home to some of Mexico's most numerous and impressive archaeological sites, all of which belong to the Mayan civilization. The most important of these sites are Palenque, Bonampak and Yaxchilan, but there are many more sites and ruins that still lie unexcavated under the vegetation. Palenque lies on the edge of the Lacandon, where the Eastern Mountains meet the Gulf Coast Plains. It is not the largest Mayan archaeological site, but it has some well-preserved sculpture and architecture the culture produced. Major structures include the Temple of Inscriptions, the Temple of the Sun and the Temple of the Cross; however, only a small fraction of it has been excavated. Away from the ceremonial center and on the way to the site museum are smaller buildings around the Otolum stream with a small waterfall.