Can anybody tell me what I saw?

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We just got back from an amazing ten days in Peru. When we left Aguas Calientes on the train headed for Cusco, just after we left there was a lock and dam on the river on the right side and, a little bit after that, up on the hills on the right side, was an Incan ruin right next to a wonderful waterfall. Does anybody know the name of this site and/or have a picture you would be willing to share

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