Sorry, I should have added more information.
This indeed must be an airfield, on the Balkans.
But Bulgarian or German? Or mixed?
In a Bulgarian book about the aircraft of Bulgaria, found a picture of a LVG on Bulgarian service, it has a very close number - B 1510! Here it is, announced to be a LVG C.II with a Parabellum for the pilot and a Madsen MG for the observer....
But need to add, that found information, that 6 LVG B.II were delivered to Bulgaria in November 1915 and used on the Balkan front. At that time, were the LVG armed??
And one more thing to add, on the pictures from the airfield managed to spot one more number on such aircraft - B 1503
Ok now, let me add one more question: what is the difference between LVG B and LVG C? Can the difference be spotted on pictures of these aircraft or is not that significant?