That is really interesting. the lighting and shadows look correct. Generally entrances to these temples are centred, the "entrance" to this looks a little offset.

I have posted reasonable comments on other photos in the past and do not get a very receptive response so I will differ to other experts as to if it a CGI addition. But it dosent appear to be a natural formation. Nice find S&F

Its nothing. Trust me, if it "were" something substantial it would not be available for our viewing.

These types of photos are usually edited and photoshopped. Haven't seen this one before, but this could very well be a natural feature. Very cool find, even cooler if it could be seen in more detail/depth!

Ya i was just skimming around and found it it looked rather odd thought i would point it out other then that i will keep looking.