Pillar at Garnedd Goch
This cache is hidden just off the summit of Garnedd Goch on Crib Nantlle in Eryri. At exactly 700m above sea-level, it's by no means the largest or most popular mountain around but still well worth the walk up. You're looking for a small clip-lock box with a waterproof log that will hopefully stand the test of time (and good old welsh mountiain weather).

Given the listed status of the historic summit (ancient cairn), it would be inappropriate to hide anything there. This cache is hidden just over the wall from the trig, away from the loose stone which makes up the monument.
There are a number of routes up to GZ. The closest parking is given as a waypoint.
About Ye Ole Survey Monuments
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Ye Ole Survey Monument (YOSM) is a captivating series of caches that pays homage to the remarkable legacy of OutForTheHunt's YSM series (GC45CC).
YOSM caches are strategically positioned at or near Trig Points. These triangulation stations have played a pivotal role as surveying landmarks, contributing to the mapping of expansive territories.
Some of these points, bearing historical significance, might now be situated on private land or have vanished with time. As a result, the caches are artfully placed in close proximity, reverently acknowledging the historical importance of these survey monuments.
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More information, bookmarks and statistics can be found at the YOSM Website
If anybody would like to expand the Ye Ole Survey Monuments Series, please do.
I would ask that you request a number for your cache first at www.yosm.org.uk
so we can keep track of the numbers and names to avoid duplication.