SAN DIEGO (FOX 5/KUSI) -- There’s a secret world of adventurers in San Diego, and they’re hiding in plain sight — armed with GPS devices, smartphones, and a serious love for the outdoors.

They're geocachers, and this year they’re celebrating something big: the 25th anniversary of geocaching, the global game of high-tech hide and seek that’s been turning everyday locations into treasure hunts since 2000.

If you’ve ever seen someone poking around under a park bench, examining the hollow of a tree, or combing the edge of a trail with purpose — chances are, you’ve witnessed a geocacher in action.

Over 2,000 hidden caches in San Diego

With more than 2,000 geocaches hidden within 10 miles of downtown San Diego, the city is a hotspot for treasure hunters of all ages. From Mission Trails to To

See Full Page