Letterboxing is an intriguing “treasure hunt” style outdoor activity. Letterboxers hide small, weatherproof boxes in publicly-accessible places (like parks) and post clues to finding the box online on one of several Web sites. However, clues to finding some of the most highly-sought boxes are passed around by word of mouth.

There are about 60,000 active letterboxes listed on LbNA alone. Individual letterboxes usually contain a log book, an often hand-carved rubber stamp and occasionally contain an ink pad. Finders make an imprint of the letterbox’s stamp on their personal log book, and leave an imprint of their personal stamp on the letterbox’s logbook.

1. Ski Alta Salt Lake City, UT
2. Jeremy's Letterbox Baywood Park, CA
3. Jason: Horror Classics Series 5 of 6 Northfield, VT
4. Freddy: Horror Classics Series 4 of 6 Northfield, VT
5. Letterboxing 101 San Marcos, TX
6. The Windflower Fairy Spicewood, TX
7. Lawry's The Prime Rib 1938 Beverly Hills, CA
8. Citrus Raleigh, NC
9. Donut Patrol Spring Branch, TX
10. Rushmore Waterslide Black Hawk, SD
11. Roast To Go 1952 Los Angeles, CA
12. Saw: Horror Classics Series- 3 of 6 Graniteville, VT

More new letterboxes

1. Succulent Garden 2 of 3 Austin, TX
2. Succulent Garden 3 of 3 Austin, TX
3. Succulent Garden 1 of 3 Austin, TX
4. Sweet Heart Manchester, CT
5. Desert Toys Series Victorville, CA (1/3)
6. Love Those Movies: Bolt Barstow, CA
7. Boron UrbEx Mission Boron, CA
8. Desert Dandelion California City, CA
9. Vox Populi Colchester, CT
10. Nom de Bloom Series Tyler, TX (3/8)
11. The Story Nest at Cottage Gardens Colchester, CT
12. A Boating We Will Go Lebanon, CT (1/5)

I added a new column clue search results to show the estimated round-trip length of the hike for a clue. There is also a new option to search for a specific hike length.