Archaeologists uncover secret Inca underground streets beneath Cusco, revealing a sophisticated ancient road network.

A sophisticated network of underground streets created by the Inca Empire has been discovered beneath the city of Cusco.

The Inca transformed agriculture in the Andes, using dramatic terraces like these at Moray to grow warm-weather crops in a cold-weather climate. The Inca Empire encompassed mountains, forests ...

crop terraces, irrigation canals, temples, or fortresses. In return, rulers paid their laborers in clothing and food. Silver and gold were abundant, but only used for aesthetics. Inca kings and ...