Letterbox enthusiast carves his own rubber stamps from erasers. Check out samples of his work or learn how to make a rubber stamp from scratch.

Get an introduction to the recreational activity, 20 simple guidelines for beginners, and an explanation of who is behind the hidden letterboxes.

Get a downloadable explanation of letterboxing to include in the construction of a new box, so as to inform unwitting hikers about the hobby.

Browse through introductory FAQs about letterboxing, click on the US map to get clues by state, join the talk list.

Get clues to track down letterboxes hidden in several state parks of the eastern US. Includes footnotes about the park and a difficulty rating.

Get background info about and clues to find letterboxes hidden in eastern PA. Click on a state map to access clues, or follow related links.

These central Vermont towns are host to several hidden letterboxes. Click here for clues, maps, and a picture of the letterbox stamp.

Read this article form Smithsonian magazine to better understand the history and practice of letterboxing. Includes informative links.

Access clues and a map to letterboxes hidden in parks outside Wendell, Massachusetts. Follow links to get details about state parks.