Links

1. Earthcache.org
   An EarthCache site is a special place that people can visit to learn about a unique geoscience feature or aspect of our Earth.
   http://www.earthcache.org/

2. Geocaching.com
   The original and largest Geocaching website, founded in 2000 and currently operated by Groundspeak.
   http://www.geocaching.com/

3. GPSGames.org
   International listing service for geocaching as well as similar alternative activities.
   http://www.gpsgames.org/

4. Navicache.com
   Originally started as a regional listing service in 2001, Navicache is more liberal with their listings than other caching websites.
   http://www.navicache.com/

5. Terracaching
   An alternative to Geocaching.com, Terracaching is highly member-oriented and focuses on providing higher quality caches than other caching websites.
   http://www.terracaching.com/