Geocaching is the world’s largest treasure hunting game. Over 3 million cleverly hidden containers called geocaches are hidden all over the world just waiting to be found. Geocaches come in all shapes and sizes—geocache creativity is endless! Some will be large reusable containers, others will be micro canisters the size of your fingernail. Make sure to read the size in your app to get on the right path. (Geocaches never require digging).