"The Castles"
This rock formation in the Quebrada del Rio de las Conchas is called Los Castillos. Apparently it´s privately owned, as are all parts of the valley so you can´t get very close to this bit. If I understood correctly, this area was declared a UNESCO world heritage site in the 90s but the title was removed when the local people (and owners of the land) didn´t comply with the strict UNESCO regulations. That´s Argentina for you, I guess!