After the Salkantay trek we felt like we wanted another challenge and decided to climb the Rainbow Mountain on the 29th August. The air gets thin at an altitude of 5,200m / 17,060 ft. But don’t worry, the tour guides normally carry oxygen just in case. There are horses for hire to carry up anybody with altitude sickness. The Rainbow Mountains are an absolute must-see when visiting Cusco. We did an 8 hour hike up to the Rainbow Mountain and back through the Red Valley. Check out these absolutely stunning views!