National Parks
Black Canyon of the Gunnison
Bryce Canyon
Carlsbad Caverns
Everglades
Grand Canyon (both rims)
Great Smoky Mountains
Guadalupe Mountains
Mammoth Cave
Mesa Verde
Petrified Forest
Rocky Mountain
Saguaro
National Monuments
Canyon de Chelly
El Morro
Gila Cliff Dwellings
Montezuma Castle
Petroglyph
Statue of Liberty
Sunset Crater Volcano
Walnut Canyon
Wupatki
WW II Valor in the Pacific (Pearl Harbor)
National Historical Parks
Chaco Culture
Jean Lafitte
Natchez
National Historic Sites
Fort Davis
Hubbell Trading Post
National Military Park
Vicksburg
National Recreation Areas
Amistad
Boston Harbor Islands
Glen Canyon (Lake Powell & Lee's Ferry)
Lake Mead
National Seashores
Cape Cod
Gulf Islands (both the Mississippi and Florida units)
Padre Island
National Parkways
Natchez Trace
Plus several sites / memorials in the National Capital District.