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Near the south-eastern shore of Lake Titicaca lie the ruins of the ancient city state of Tiwanaku. Tiwanaku contains monumental architecture characterized by large stones of exceptional workmanship. Green andesite stones, that were used to create elaborate carvings and monoliths, originated from the Copacabana peninsula, located across Lake Titicaca. One theory is that these giant andesite stones, which weigh over 40 tons were transported some 90 kilometres across Lake Titicaca on reed boats.