Letterboxing is a mix of treasure hunting, hiking, beautiful scenery, navigation, and art. It can take you to nearby locations or to exotic locales around the world. Its based on the ancient traditions of placing a rock on a cairn (pile of rocks) when you reached the summit of a mountain. It apparently became letterboxing when an Englishman left his calling card in a bottle on the moors of Dartmoor, England, according to Letterboxing North America.
All you need to start is a notebook, a rubber stamp, and a waterproof container.
FYI Shorthand: P F X are used by many letterboxers to keep track of the following:
P = boxes they have placed
F = boxes they have found
X = stamps that they have exchanged with other hikers theyve met along the way.
This is an odd breed of letterboxing that has sprung up in recent times. Its a letterbox set that is stashed in another letterbox. Someone that finds it is expected to take it to a different letterbox and stash it in a new how. Its a bit of a vagabond letterbox.
Recently there is a new twist on this popular pastime, called geocaching. In order to play this particular version you need to be able to go a bit more high-tech. The directions in this version require a GPS or Global Positioning System. Although these used to be only for the rich and famous, the price of some of the hand-held version has dropped down to the $100 range. So, if letterboxing is your thing and youd like to take it to the next level, yo can with a little saving.
Letterboxing North America
This site gives you the background on this pastime and houses clues for all 50 states and seven different countries (so far).
Source: Letterboxing North America