Explore the Inca Empire's military fortress, Sacsayhuamán

Sacsayhuamán was an important military fortress during the Inca Empire. The ninth king of the Inca Empire used 30,000 people every day for 80 years to build this giant stone fortress, which still amazes people today. The largest stone weighs 300 tons and is 18 meters high. It was quarried from the opposite mountain using the primitive method of burning and cooling with water. The stones were then polished and fitted together without cement, and they remain perfectly intact! It's hard to imagine how the Incas managed to move and stack the stones without modern tools. ​ From the top of the fortress, you can overlook the entire city of Cusco.