The TiwanakuThe city of Tiwanaku lies ruined in the rugged Andean steppe of Bolivia twelve thousand feet above sea level, the highest urban settlement of the ancient world. Its wide streets open towards ramparts of glaciated mountain peaks and the intense blue waters of Lake Titicaca. Gigantic stone sculptures and shattered architectural blocks suggest profound antiquity and the passage of great events, now lost and unremembered. Here, two and a half thousand