Geocaching - Geocaching is a real-world, outdoor treasure hunting game using GPS-enabled devices. Participants navigate to a specific set of GPS coordinates and then attempt to find the geocache (container) hidden at that location.

OpenCaching North America - This is the official Opencaching site for North America and all US Territories. This site went live on August 18, 2010. Our goal is to have a database of quality, unique caches that, once approved by the OC Team, are enjoyed and rated by YOU, the geocaching community. Many of our listings are unique to our database and are not found on any other site.

Munzee - Munzee is a real world scavenger hunt game where items are found in the real world and captured using your smartphone. You then level up and gain rank based on your score. Points are obtained by capturing other people's munzees or when your deployed munzees are captured by someone else. Munzee is based off of the fundamentals of geocaching and adds another layer of fun to the hunt.

TerraCaching - TerraCaching.com is a community of cachers and a listing of TerraCaches hidden all over the world with a little help from handheld Global Positioning System receivers and available exclusively to TerraCaching.com members. TerraCaching.com employs a complex, dynamic rating system which learns from members and actively encourages a focus on the quality, not quantity, of caches that members post.

Where's George - The purpose of Where's George? is to track the natural and geographic circulation of currency.
When you enter the bill you found, you will get back a list of all the cities, states, and countries where that bill has been recorded, as well as travel time, distance and speed of each step along its journey.

Waymarking - Waymarking is a way to mark unique locations on the planet and give them a voice. A waymark is a physical location on the planet marked by coordinates (latitude/longitude) and contains unique information defined by its waymark category.

Letterboxing North America - LETTERBOXING is an intriguing pastime combining navigational skills and rubber stamp artistry in a charming "treasure hunt" style outdoor quest. A wide variety of adventures can be found to suit all ages and experience levels.

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