Ancient Ruins of Tiwanacu and PumaPunku. Tiwanaku (Spanish: Tiahuanaco and Tiahuanacu) is an important Pre-Columbian archaeological site in western Bolivia, South America. TIAHUANUCO lies almost in the very centre of the great terrestrial basin of lakes Titicaca and Aullagas, and in the heart of a region which may be properly characterized as the Tibet of the New World.