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Geocaching (pronounced geo-cashing) is an activity for the entire family, individual, or any group.  The goal, using a Global Positioning System (GPS) receiver, is to find a hidden cache. 

A cache may be as small as a pencil erasure to as large as a car – but usually about 4 X 4 inches, which contains a log, on which to write your name, and often some trade items, or swag, if you remove an item you are supposed to leave something else, of like kind, in its place. 

Caches are placed for many different reasons; present a challenge to find, share a special location with others, or education about some facet of a given location.  Education is the main goal of the National Museum of Natural History’s GeoTour.  The cache pages and the puzzles involved are to introduce you to some of the active research by the museum’s scientist.  To take you beyond the exhibits and introduce you to the wide variety of materials on the museums many web sites. 

For more information on Geocaching, check out Geocaching 101 and the below video:

To participate in Smithsonian NMNH Geocaching / GeoTour activity, users must register at, which is a third party website owned operated by Groundspeak, Inc. which is the primary facilitator for the Geocaching community worldwide. Please be advised that / Groundspeak Terms of Service ( and Privacy Statement ( applies to your use of these services. The links to are provided for participation and informational purposes only, and they do not indicate the Smithsonian’s endorsement, sponsorship of, or affiliation with or Groundspeak Inc. or content of those websites, including any advertisements that may be posted. The Smithsonian has no control over, makes no representation or warranty and bears no responsibility for the accuracy, legality or content of the externally linked sites. For more info on the Smithsonian Terms of Use, see: and the Smithsonian Privacy Policy at:

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