piedras encimadas valley is located in san miguel tenango. it is private land that extends over 300 hectares owned by a group of thirty partners. legend states that the rocks were giants who were punished by a pre hispanic god by being turned to stone. other stories about the rocks say that the area was once under the sea or that extra terrestrials made them. the rocks are over 65 million years old formed by volcanic activity. since that time, wind, rain and chemical reactions have eroded the rock to leave the current formation, some of which are up to twenty meters tall. most of the rock structures can be reached on foot. a number of the formations resemble humans, columns, portals, castles, monsters and animals. piedras encimadas offers camping, extreme sports and horseback riding.