Well spotted sir! When I was interested in Geocaching a few years ago I noticed a whole series of caches at 'key intersections' typically at co-ordinates with lots of zeroes. Many of these were in non-descript locations in the middle of a field but I recall one that was on a cup & ring stone which was a remarkable co-incidence.
Just trawled Europe on my longitude and the closest hill I've been up near the line is La Rhune but that was twenty odd minutes away. Pleased to see that Pic D'Iparla on the GR10 near Bidarray is right on the money, though!