Classified for credit

NPS-managed aquatic garden and tidal wetland — covers aquatic plant biology, migratory bird ecology, and Anacostia River watershed geography.

Working horse park and museum covering equine breeds, care, and the horse's role in American history — supports biology, agriculture, and cultural history.

Wisconsin state forest on glacial terrain — field study in glacial geology, forest ecology, and landform identification with hiking trails and naturalist programming.

NPS recreation area centered on the largest US reservoir — covers arid-land ecology, hydrology, dam engineering history, and Mojave Desert geography.

NPS recreation area on the reservoir created by Grand Coulee Dam — covers hydrology, regional ecology, and Columbia River history.

Deep canyon preserve with waterfalls and canyon-rim trails — covers canyon geology, river ecology, and Alabama's unique plateau biodiversity.

AZA-accredited zoo with active conservation programs — covers animal biology, ecology, and wildlife conservation across hundreds of species.

Botanical garden and arboretum with outdoor sculpture — covers plant biology, ecology, and landscape design across 158 acres.

AZA-accredited zoo with strong conservation programming — covers zoology, animal behavior, and global habitat and biodiversity.

NPS visitor center and recreation area along the urban Mississippi River — covers river ecology, watershed geography, and the role of the Mississippi in American history.

Vast Mojave Desert preserve with cinder cones, lava flows, and Joshua tree ecosystems — geology, desert ecology, and geomorphology in the field.

Grizzly bear rescue sanctuary with naturalist-led programs — covers bear biology, wildlife conservation, and large-mammal ecology.

Maine's largest lake region offering boreal ecology, watershed geography, wildlife observation, and outdoor education in a remote wilderness setting.

Mt. Washington (6,288 ft) — alpine ecology, extreme-weather meteorology, and the Auto Road/Cog Railway summit access.

444-mile historic trail through the Natchez Trace corridor — covers Native American trade routes, early American geography, and riparian ecology along maintained trail segments.

Tropical rainforest national park in American Samoa — covers Pacific ecology, coral reef biology, and Polynesian cultural history.

State park centered on a 215-ft natural limestone arch — covers karst geology, regional ecology, and Virginia natural history.

Kentucky state park featuring a natural sandstone arch — covers geology, karst/arch formation, Appalachian ecology, and trail-based physical education.

Yosemite Valley nature center at Happy Isles covering Sierra Nevada ecology, river habitat, and wildlife biology with hands-on exhibits.

1.1-million-acre federal reserve protecting the unique Pine Barrens ecosystem — ecology, watershed science, and rare species biology with ranger programs.

NPS-designated scenic river corridor in the Nebraska Sandhills — covers riparian ecology, Great Plains geography, and river geomorphology through paddling and ranger programs.

Large-animal sanctuary housing exotic and domestic rescues — covers animal welfare, conservation biology, and veterinary science.

Wild and scenic river corridor with visitor center covering river ecology, geology, and whitewater hydrology in the Cumberland Plateau.

Cape Lookout National Seashore and Ocracoke Island barrier islands — coastal geology, tidal ecology, migratory bird habitat, and maritime geography.