Clearly the hex columns of a basaltic igneous structure. But there have been others apart from the GC in Antrim.
I sense a trick question - the Scout in the background clearly plays a part in the puzzle.
There is a lot of Basaltic intrusion formations associated with the TIC in Mull but I don't recognise the rest of the shot.
Somewhere else bar Ulster or Scotland perhaps?
H-R wearing his geologist hat...