Built in the fifteenth century and considered by the historians to be one of the most audacious Inca constructions, the remarkable Wiracocha temple at Raqchi, 100m long and 20m wide is made of adobe walls built on top of volcanic stone foundations. These Pre-Columbian foundations display the Cyclopean polygonal masonry of the Incas - almost defying belief with the way the massive multi-faceted blocks fit together seamlessly.