SEATTLE — Geocaching celebrates its 25th anniversary this year.

The global game of hide and seek started in May 2000, when the U.S. government flipped a switch that made GPS signals far more accurate for civilian use.

Just one day later, a man named Dave Ulmer hid a container in the woods near his home in Beavercreek, Oregon and posted the coordinates on a website. Within just a few days, the container had been found by two people and the activity of geocaching had been born. He called it the "Great American GPS Stash Hunt."

What started as one container hidden in the Oregon wilderness quickly grew as outdoor enthusiasts and tech fans began hiding and seeking their own "caches." Within months, the activity earned a new name: geocaching.

The nerve center of this worldwide hobby is Geoc

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