Pyramid Akapana - one of the main attractions of Bolivia, which contributed to the 2000 UNESCO World Heritage List as "evidence of the power of the empire that played a major role in the development of civilization of pre-Columbian America" .  Until now, it remains a mystery to researchers as the natives of South America have been able to build a pyramid of stone on a high plateau .  After all, some of the stone blocks weigh more than 200 tons .  Akapana part of the ensemble of the complex of the ancient city of Tiwanaku .  Multi pyramid towered 15 meters above this mysterious place and is adjacent to the semi-subterranean temple .  Now at the bottom of the excavation Akapana still going full speed .  Once there were found ancient burial skeleton of a man, priest or leader, remains Lama and gold jewelry, the area has become very popular not only with tourists but archaeologists .  The find was unique simply because in South America to discover the remains of pre-Columbian intact almost unreal .  Visit the Pyramids and the most complex of Tiwanaku, became obligatory route for all who come to Bolivia .  Therefore, the authorities decided to throw all forces to restore Akapana .  To return to her previous form using adobe .  However, experts on the protection of cultural monuments are concerned that the foundation of the ancient pyramids can not withstand the load .