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.

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