Tiwanaku, a UNESCO World Heritage Site, is a testament to a pre-Columbian civilization that thrived in western Bolivia near Lake Titicaca. The city's ruins, including the iconic Akapana pyramid and the intriguing semi-subterranean temple adorned with carved human heads, reflect a complex society that peaked around AD 800. The site covers approximately 4 square kilometers and showcases a variety of artifacts, from decorated ceramics to megalithic structures, revealing a culture rich in art and architecture.