This short series takes you through the 10 years of changes we've seen in geocaching starting with the traditional tupperware box finishing up with, well, the areas current puzzle and maybe the future?! In each container is a number which you need to locate the bonus cache.
Cache number 4: We have all spent many hours getting up close and personal with these, the Ivy Covered Tree. The popularity of the ICT and a tiny nano cache in it has grown rapidly recently and so in charting the changes in geocaching we have to have one of these 
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Evtug unaq gehax nobir urnq.