Thanks to Wikipedia for this explanation: “Tampu Mach’ay is an archaeological site associated with the Inca Empire, located near Cusco, Peru. An alternate Spanish name is El Baño del Inca. It consists of a series of aqueducts, canals and waterfalls that run through the terraced rocks.”  The 1973 card is unused, with very mild spotting on the back.  Grade: 2