From the article:
Chan Chan. The world’s largest adobe built city receives a tiny fraction of the visitors that Machu Picchu receives. Ten citadels, all walled, make up the site and within them are scores of temples, burial chamber and reservoirs. Triangular in shape the wall that surrounds it can reach sixty feet in height. You can easily get lost in this vast city, made up of a labyrinth of walkways. The surface of walls made from adobe brick were smoothed over and everywhere you will see highly detailed carvings, mostly of animals.