This cache is inspired by "Let me be Franc with you GC491M3". I liked the idea, but it was archived. Here is the text from that page:
As a nod to the truly international little area hidden up here in the hills, this cache contains a log & a small collection of foreign coins. I ask that you feel free to trade out foreign coins or geocoins, but that you not take one unless you have one to trade.
So, find the cache, trade some coins, and enjoy the trail. VERY heavy muggle activity in the area, so be on your best stealth.
Please rehide as well or better than you found it!