For 10 points, name this pre-Inca city near Lake Titicaca.
Arthur Posnansky, a famous archaeologist of this city, estimated it to be 17,000 years old and defended it with a gun tower to keep locals away. This city developed the suka qullu farming technique in which fields are raised above canals, keeping the crops insulated from freezing temperatures and increasing yields up to 50% over modern methods. A religious complex in this city is used for the modern day celebration of the winter solstice holiday Willkakuti despite it no longer being aligned to the solstice. The Akapana is a mud brick pyramid in this city that acted as an artificial mountain and home to the ancestors. This city contains the (*) Kalasasaya temple, which includes the Gates of the Sun and Moon, and remains an important religious center for the Aymara people. For 10 points, name this pre-Inca city near Lake Titicaca.
Arthur Posnansky, a famous archaeologist of this city, estimated it to be 17,000 years old and defended it with a gun tower to keep locals away.
Tiwanaku