Through this cache, you'll find a paleolithic zone with some art in stone. These rocks show us some zoomorphic and antropormophic drawings that were subject to main discussion during the construction of the A28 highway.
All you have to do is to find all the 4 ancient sites, compare them to the photos I've published in this site named A, B, C and D and attribute them a number (Site 1 refers to a letter, site 2 refers to a different one and so on...)
After that you only have to replace the letters by the correspondent numbers to have access to the final cache coordinates:
N 4Bº 5C.A62
W 008º 47.3D2
Have fun, and remember: the sites are fragile, please be careful and avoid stepping the stones; there are periods of the day most favorable to view the drawings. If you visit the sites at the sunset, you will be fascinated. The drawings are almost imperceptible at noon.
You can check your answers for this puzzle on Geochecker.com.
