Geocache - the ultimate treasure hunt

Country Walking goes all Challenge Anneka as it sets out to go geocaching.

It's the ultimate treasure hunt - download the clues into your GPS, and head off into some majestic walking country to find the bizarre and baffling treasures that hide right under the walker's nose.

For the first in a series of adventures, we're heading to The Long Mynd in Shropshire for what might just be the UK's best geocache trail.

Military secrets, a misty hillside and a rubbish bridge combine in an adventure that leaves hapless reporter Nick Hallissey treasuring his walking socks.

So come with us, and discover why fans claim geocaching is the UK's fastest-growing sport.

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Click here to see Geocaching Part Two