South of Lake Poopo is the largest system of canals, dams, reservoirs and dikes ever constructed in the world. They have probably been considered to be natural in the past but canals can be seen radiating from the northern end of the system to fossilized agriculture on the plain surrounding the lake. The construction and design of the dams is exactly the same as ones found at Palpa near Nazca, so we know they are not natural. As I was surveying the area via satellite images at the south end of the great salt flats, The Sayal de Uyuni, I discovered what appears to be the largest pyramid in the world. There is no other archaeological record of this structure that I can find. It is much larger, almost twice as long and the Great Pyramid at Giza, and about 100 feet higher. See the video below for a tour of the structure.