History, archaeology, exploring, hiking, all those things are of serious interest to me and I enjoy posting photos along those lines. I remember seeing the older photo a few months ago while looking for photos that piqued my interest.
I read up on the photo and the person who took it - Hiram Bingham. He was a Yale lecturer, explorer, treasure hunter and later Senator. He had explored the city of Choquequirao in the south of Peru in 1909 before being told of another archaeological wonder, Machu Picchu. Accompanied by local indigenous farmers, Bingham traversed the hilly jungle clad region and found himself at the city's ruins. He went on to announce to scholars the discovery of Machu Picchu on 24 July 1911.
Here's a more recent photo to give a comparison of the two very different appearances of Machu Picchu from then to today.