Geocaching is a cool new activity that offers all the outdoor adventure and intriguing pursuit of a traditional treasure hunt, with a high-tech twist: Global Positioning System (GPS) technology. Armed with these tracking devices, enthusiastic participants hide and seek "caches" all over the world. Geocaching provides engaging opportunities for learning about history, math, science--the possibilities are limited only by the imagination. In this article, the authors provide links and resources geocaching project or activities.