I recently these excellent illustrated map T-shirts at my local REI store (click here for purchase info). One displays the national parks of Colorado, another the parks of Washington. I especially liked the one of the Appalachian Trail. The AT — from Springer Mountain, Georgia in the south to Mount Katahdin, Maine in the north — extends for 2,200 miles and crosses through 14 states. It is one of the longest hiking trails in America and is one of the Triple Crown of Hiking (the others being the Pacific Crest Trail and the Continental Divide Trail). Hikers typically reserve 4-7 months to hike the AT, though it has been done in as little as 50 days. Click here for more information on the AT.