1888-1891. Front facade of Pyramid Temple and Pyramid (cf. reconstruction drawing above-center to see how much had collapsed).       
1888-1891 photograph by Henry N. Sweet as a member of the Thompson/Peabody expedition; scanned from 35mm slide of original photograph at Dumbarton Oaks. Reproduced Courtesy of the Peabody Museum of Archaeology and Ethnology, Harvard University.