Although it's not in on the Riviera Maya, Palenque is truly one of the wonders of the world. Immersed in dense jungle high up in the hills this is a different type of ruin adventure. Climb the masses of steps to get the best views ~ Mexico.
Yucatan: Uxmal Maya building ~ Uxmal is an ancient Maya city of the classical period in present-day Mexico. It is considered one of the most important archaeological sites of Maya culture, along with Palenque, Chichén, and Calakmul.