You are looking for a GEOCACHE. Hope that helps. Bring your pen or step inside and I'll give you one. Also don't overlook the WiFi multi-cache while you're here.
"terrybaldridge First To Find"
Welcome to THE ENDLESS POWER TRAIL #30.
I'm helping Awhwa build a new type of caching trail where cachers pickup containers with numbers on them from THE ENDLESS POWER TRAIL #1,GC41RV8.
Geocachers Rule!!!