Cusco City in Peru, in South America Cusco is the oldest continuously inhabited city in the Americas and a UNESCO World Heritage Site. The ruins of the ancient Inca city became the basis for the Spanish architecture you see today, and many of the stone walls that line the streets were built by the Incas. Earthquakes shook Cusco in 1650, 1950, and 1986, and in each of them the Inca masonry on which later buildings stood survived, while colonial and other buildings collapsed above. After each earthquake...
