Guidebooks Description and travel 104 Geology 30 Architecture 22 Hiking 10 Buildings 9 Historic sites 9 more ... Automobile travel 7 Geology, Stratigraphic 7 Antiquities 5 Camp sites, facilities, etc 5 Historic buildings 5 History 5 History, Local 5 Homes and haunts 4 Social life and customs 4 Literary landmarks 3 Museums 3 Tours 3 Architecture, Modern 2 Art museums 2 Biography 2 Buildings, structures, etc 2 Cities and towns 2 Excavations (Archaeology) 2 Fortification 2 Historical museums 2 National parks and reserves 2 Paleontology 2 Trails 2 less ...