MARCAHUASI (4100m) is a high plateau that makes a fantastic weekend camping jaunt and is one of the more adventurous but popular excursions from Lima. Its main attractions are incredible, mysterious rock formations, which, particularly by moonlight, take on weird shapes – llamas, human faces, turtles, even a hippopotamus. Located 90km east of Lima (40km beyond Chosica), the easiest way to visit this amazing site in the hard-to-access Santa Eulalia Valley is on a day-trip from Lima (see Travel agents and tours). The annual Festival de Aventura takes place in Marcahuasi in early November, incorporating live music with outward-bound activities such as mountain biking, marathon running and motocross. Visitors at the end of July may well come across the annual village festival involving three days of ceremony, music, dance and festivities.