Harry Grant Olds (1869-1943) was one of the most successful early photographers of Buenos Aires, coming to Argentina in 1900 after a brief stint in Valparaiso, Chile. This photo was taken in 1900 in the northwest corner of Recoleta Cemetery. Of note are the large mausoleum for the Familia del Carril, the monument to federal judge Virgilio M. Tedín &—although blending into the trees a bit—the memorial to Luis Viale.
Source: postcard sale on Mercado Libre… a great online source for finding old photographs. More incredible photos by Olds can be found in a collection titled “H.G. Olds, Fotografías 1900-1943, Un norteamericano retrata la Argentina (Ediciones de la Antorcha, 2011).