The highest city that has hidden urban streams is the former imperial capital of the Incas. At more than 11,000 feet above sea level, Cusco, Peru is a magnet for tourism and home to a thriving Native culture deep in the Andean Mountains. The main river flowing through this city is the Huatanay. A trickle in comparison to the Amazon, but that’s what its water will eventually become.
Within the city are nearly a dozen tributaries that date back to the Inca period, some of them running as ditches and other covered by modern streets.