Sacsayhuaman (the guides joke it’s pronounced “sexy woman,” but it’s actually ” sak-sigh-wah-MAHN”), features a spectacular, fortress-like structure built of huge carved rocks, joined perfectly without any mortar or mechanical aids. We approached Sacsayhuaman from below, looking up at the walls, for it sits on a hill overlooking Cuzco, which was the sacred center of the ancient Inca Empire. http://ping.fm/2Y3ey