Classified for credit

Utah national park featuring canyon geology, riparian ecosystems, and ranger-led programs covering plate tectonics and desert ecology.

Alaska Zoo in Anchorage specializing in cold-climate and Arctic wildlife — covers subarctic ecology, animal adaptations, and wildlife conservation.

National lakeshore on Lake Superior featuring sea caves, island ecology, and Great Lakes geography with ranger-led programs.

National Scenic Trail spanning 14 states with ranger programs at Harpers Ferry headquarters — covers Appalachian ecology, geography, and trail conservation.

Audubon nature center with working farm and trails — covers bird ecology, sustainable agriculture, and native Ohio habitats.

700,000-acre subtropical wilderness preserve — covers wetland ecology, cypress ecosystems, wildlife biology, and South Florida hydrology.

National recreation area along the Big South Fork gorge — covers river ecology, geology, and Appalachian natural history with developed visitor facilities.

NPS preserve protecting rare convergence of four North American ecosystems — field study in biodiversity, plant communities, and wetland ecology.

NPS canyon and reservoir recreation area on the WY/MT border — covers geology of canyon formation, high-desert ecology, and Great Basin geography.

NRA straddling Wyoming and Montana with dramatic canyon geology, wild mustangs, and bighorn sheep habitat — geology, ecology, and Great Plains geography.

West Virginia state park anchored by a 65-foot waterfall in a mixed hardwood canyon — geology, forest ecology, and watershed study with developed trails.

AZA-accredited zoo in Des Moines with conservation programming — supports zoology, animal biology, and wildlife conservation curricula.

469-mile scenic parkway through the Appalachians offering geology, forest ecology, and Appalachian cultural history via ranger programs and visitor centers.

Federal wildlife refuge on the Delaware Bay flyway — supports migratory bird biology, wetland ecology, and waterfowl conservation studies with observation towers and trails.

National and state park island chain in Boston Harbor — covers coastal ecology, tidal zones, and 19th-century harbor fortification history.

AZA-accredited municipal zoo with over 1,800 animals and active conservation programs — covers zoology, ecology, and wildlife biology in a hands-on outdoor setting.

Outdoor sculpture garden and wildlife preserve with native plant collections and wetland habitats — supports botany, ecology, and art history in a single visit.

First U.S. national river with undeveloped Ozark corridor — covers river ecology, geology, and riparian biology with ranger-led programs.

Large resort garden complex with native plant collections, butterfly center, and raptor program — covers botany, ecology, and wildlife biology.

Undeveloped Atlantic barrier-island seashore with ranger programs covering coastal ecology, sea turtle nesting, and estuary biology.

National seashore with barrier islands, lighthouse, and beach ecosystems — covers coastal geology, migratory bird biology, and Outer Banks maritime history.

NPS barrier-island seashore with beaches, marshes, and the Cape Hatteras Lighthouse — coastal ecology, barrier-island geology, and maritime history.

National seashore on barrier islands covering coastal ecology, tidal processes, and lighthouse history through ranger programs and beach exploration.

Nonprofit big-cat sanctuary offering guided tours of rescued tigers, lions, and other wild felines — covers wildlife conservation and exotic-animal welfare.