Walking Historic sites 25 Hiking 16 Historic buildings 13 Description and travel 10 History 10 Trails 9 more ... History, Local 8 Outdoor recreation 8 Homes and haunts 6 Mountaineering 5 Backpacking 4 Alpine regions 3 Antiquities 3 Buildings, structures, etc 3 Cities and towns 3 Cycling 3 Day hiking 3 Mountain plants 3 Running 3 Architecture 2 Artists 2 Cross-country skiing 2 Gettysburg, Battle of, Gettysburg, Pa., 1863 2 In literature 2 In-line skating 2 Intellectual life 2 Literary landmarks 2 Mountain biking 2 Natural history 2 less ...