I ran across this site while logging some caches: http://www.extreme-caching.com/ I climbed to three high elevation caches listed on this site last week near Estes Park, CO, the hardest being the one on Longs Peak at 14,259 feet with a 15 mile RT, 5000+ foot elevation gain to get to it (one of my toughest finds). The three that I found are: I C U A Pair of Queens It's a Long way up! Some photos of my trip are at: http://www.facebook.com/album.php?aid=104166&id=647023700&l=6776a62ce3