SCHNACK - Letterboxing is an intriguing mix of treasure hunting, art, navigation, and exploring interesting, scenic, and sometimes remote places. It takes the ancient custom of placing a rock on a cairn upon reaching the summit of a mountain to an artform. It started when a gentleman simply left his calling card in a bottle by a remote pool on the moors of Dartmoor, in England. Today I'm off to check our Connecticut letterboxes after receiving a notice from a family that had trouble finding them last weekend.