Flying into Cusco (Peru :)), you know your landing is going to be a little tricky because the air is thin at 11,000 feet. As you approach the city, you see that there isn’t much room for error because you will be landing in a small valley surrounded by mountains, and the landing strip is flanked by 3 and 4 story apartment buildings. A modified helicopter landing! You land safely and wonder how this isolated place could have been the the center of an empire.

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