http://www.megalithic.co.uk/article.php?sid=18144 Ancient Temple in Lambayeque Department, Peru. Cerro Ventarron is a natural hill containing multiple adobe ceremonial sites that were built and used over several millennium. Artwork found in one 4000 year old adobe "pyramid" is believed to be the oldest example of a painted mural in the New World. Despite the simplicity of the building techniques, dried mud without stone, gravel, or straw filler, the building was decorated with red and white exterior paint and internal rooms contain polychrome murals adjacent to a fire-blackened altar/chimney. The culture that created it predates the famous Sipan culture of the same area by over a thousand years.