It may be true, as the poet Robert Frost told us, that "Good fences make good neighbors," but park officials at Gettysburg National Military Park have a corollary to that famous line: good fences make good history. A fence in the wrong place, however, usually leads to trouble.

Every two years, Appalachian Trail hikers, enthusiasts, supporters, and conservationists get together at an Appalachian Trail Conservancy Conference. There are hikes, workshops, excursions, and the A.T. culture.

After a short hiatus, the Mystery Photo is back, and we're not starting at Mystery Photo 101. This well-cropped image, we believe, could be a stumper. Of course, someone might recognize it right off.

In its latest edition Time magazine somehow rerouted the Yellowstone River nearly 180 miles, or moved Yellowstone National Park the same distance, in mentioning an oil pipeline leak.