Another one for the "to read" list

Tipon: Water Engineering Masterpiece of the Inca Empire:

Tipon is a little-known jewel of the Inca Empire...Located by the imperial capital of Cusco (now in Peru), the historic 500-acre, self-contained, walled settlement served as an estate for Inca nobility. For more than 450 years, it was farmed and partially irrigated, and it remains an amazing civil engineering achievement showcasing Inca mastery of irrigation and hydraulic technology.