On the morning of 1/3/25, I left the Ship with 10 other residents and flew from the airport in Lima to Cusco, on an excursion that we cobbled together ourselves. We arrived in CUSCO by noon and started taking our altitude medications. Cusco is in the Peruvian Andes at an elevation of 11,152' , which is a big jump from the sea level where we have been residing. A dull headache was the symptom most of us had. We grabbed a quick lunch and went on a 3 hour walking tour of the City. Above is central town square Plaza de Armas.