All I've ever wanted is to be Indiana Jones, so when I heard about geocaching it caught my attention.
Geocaching is an activity that makes use of a GPS device to find containers hidden outdoors. It's a real-life treasure hunt without being chased and shot at.
There are over 1 million geocaches hidden around the world, including Antarctica and the International Space Station. A cache can contain anything from a logbook for you to sign to a collection of knick-knacks for you to add to and take from.
The largest list of geocaches is maintained by a company called Groundspeak, and it developed an excellent app that makes use of your smartphone's GPS abilities to help you find caches wherever you are.