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. It's a Wonde-ful Life Hacienda Heights, CA
2. Love Those Movies: March of the Penguins Hacienda Heights, CA
3. Michelle Brooks-Totress Tempe, AZ
4. cicLAvia Hello Kitty Reseda, CA
5. GS Troop 2403’s 1st box Eldridge, IA
6. The Great White Hut 1947 Glendale, CA
7. Hiking Aptos Aptos, CA
8. Comedic Carrot Westport, MA
9. Troop 327 Lums Pond State Park Box - Into the Woods Middletown, DE
10. Troop 327 Lums Pond State Park Box – Waterview Middletown, DE
11. Troop 327 Lums Pond State Park Box - Where the Apes Play Middletown, DE
12. Tigger Hitchhiker Washington DC, DC

More new letterboxes

1. Legacy of Rev. Wightman Mystic, CT (2/2)
2. Blue Lake Daffodil Blue Lake, CA
3. Sherlock Holmess Yorkville, IL
4. Duanes' Motel Newark, IL
5. The Long King Letterbox Livingston, TX
6. Love Grows ???, NJ
7. Make the Connection Greenfield, WI
8. Mystic bus Mystic, CT
9. Dark Sacred Night Alhambra, CA
10. The Cardinal in Oxford Oxford, CT
11. Waterfalls Thirty-eight Seymour, CT
12. SOLDIER'S MONUMENT Seymour, CT

The search results were tweaked 7-Aug-15 to show the last status on the search results. This is a little controversial, but my sense is that there are more people that want to know this than not.