Nohoch Mul (Big Mound) is also known as the Great Pyramid (which sounds a lot better than Big Mound). It reaches a height of 42m, making it the second-tallest Maya structure on the Yucatán Peninsula (Calakmul's Estructura II, at 45m, is the tallest). Climbing the old steps can be scary for some. Two diving gods are carved over the doorway of the temple at the top (built in the post-Classic period, AD 1100–1450), similar to sculptures at Tulum.
The view from up top is over many square kilometers of flat scrubby forest, with glimpses of lake.