One of the largest archaeological sites in South America, located near Lake Titicaca in Western Bolivia - Tiwanaku is a brilliantly mysterious place. Believed to have been founded around 200BC, Tiwanaku is filled with monumental structures, mighty monoliths and incredible ceramics - but who built it? And why?

In the final episode of our Ancient Americas series, Tristan is joined by Dr Alexei Vranich to help shine a light on this spectacular site. With 20 tonne stones carried from miles away, across mountains and lakes - Tiwanaku is a site shrouded in mystery. Together Tristan and Alexei discuss this South American Stonehenge and try to understand how some simple reed rafts helped build this magnificent site.

For more Ancients content, subscribe to our Ancients newsletter here. If you'd like to learn even more, we have hundreds of history documentaries, ad free podcasts and audiobooks at History Hit - subscribe today!