Palenque [1] is the all-time favorite ruin of many travelers, thanks to its elegant architecture, intricate carvings, and superlative museum [2]. Much of what archaeologists know about the Maya calendar, hieroglyphics, and astronomy emerged from studies conducted here.
ToninĂ¡ [3] is a terrific hillside ruin, featuring a labyrinthine palace and temples, morbid stucco friezes, and impressive views from its high-reaching summit. The site museum here is outstanding.
Links:
[1] http://www.moon.com/destinations/chiapas/palenque/palenque-town/palenque-archaeological-zone
[2] http://www.moon.com/destinations/chiapas/palenque/palenque-town/museo-arqueologico-de-palenque
[3] http://www.moon.com/destinations/chiapas/palenque/ocosingo/tonina-archaeological-zone