Total the numeric equivalents of the letters of the common words or phrases conjured up by images 1 – 12 and call this A. Do the same for images 13 – 25 and call this B. Add 1000th of A to N45 11.120 and 1000th of B to W75 41.911 respectively to imagine the cache’s location.
In an unprecedented, and likely never-to-be-repeated, fit of generosity, the answer to #25 is “receding hairline,” for which the numeric equivalent is 141 and the DR is 6.