Rock window (perhaps hopefully onto a brighter future for us all?).
The way I took (not a path at all really) went under this rock. Very common to have a giant boulder wedged over a gully in granite country!
Granite forms on Pena del Tejo, a little to one side of La Sierra de La Cabrera proper but terrific scrambling territory in its own right. Indeed I spent a whole day here, intending to move on to the main ridge but finding a day's worth of interest at this place, including the mountain stream close-ups I sometimes post. photo taken 2012 and first posted on ipernity in 2017.