machu picchu fine grained white granite which gleams like marble - peru

A wall which abuts on the semicircular tower at Machu Picchu is notable for the beautiful symmetry of the niches in it, those hall marks of the Inca builders; between each niche is a projecting squared knob of stone. The wall itself is built of specially selected white granite of such fine grain that it gleams like marble.

From Wonders of the Past