High Quality Content by WIKIPEDIA articles! Valle de la Luna (moon valley in English) is situated about 10 kilometers from downtown La Paz, in the Pedro Domingo Murillo Province, La Paz Department, Bolivia. It is composed of an area where erosion has worn away the majority of a mountain. Due to being composed of clay rather than rock, over the centuries the elements have created a somewhat odd work of art here, like a desert filled with stalagmites. It is similar to another zone of La Paz that is known as el Valle de las Animas (the Valley of the Souls). It is an important site of the famous holiday, Dias de los Muertos (Day of the Dead)