Bookcrossing http://www.bookcrossing.com
Releasing books "into the wild" for other people to find, a community of like-minded people sharing their love of reading.
Geocaching http://geocaching.com.au/ and http://www.geocaching.com/
A Modern day high-tech treasure hunt
Markeroni http://www.markeroni.com/
Log Historical markers and Landmarks
Letterboxing http://www.atlasquest.com/lboxes/boxdirectory3.html?gStateId=1390
Similar to Geocaching but for "rubberstampers"
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