The site’s excellent museum houses a full-scale replica of Rosalila Temple. The original temple was found completely intact under another of Copán’s structures in 1991. When a new ruler was named, workers held “burials” for existing structures, then built a new temple above the previous ruler’s, creating a mountain of nested temples. It is one of the best preserved of all Mayan structures but today you can only get a glimpse of the real thing via an underground tunnel.