Classified for credit

NPS site preserving Hopewell Native American ceremonial earthworks — primary-source archaeology, pre-Columbian cultures, and Ohio geography.

Restored 18th-century iron furnace complex with living-history demonstrations covering colonial iron production, industrial history, and metallurgy.

San Antonio children's museum with hands-on interactive exhibits supporting early literacy, numeracy, and science exploration.

One of the largest freshwater marshes in the US — supports field study of wetland ecology, waterfowl migration, and Great Lakes watershed biology.

Major federal wildlife refuge and key waterfowl migration stopover — covers wetland ecology, migratory bird biology, and conservation policy.

State-operated living-history farm demonstrating Appalachian life circa 1900 — 19th-century agriculture, heirloom crops, and rural Southern social history.

National Historic Landmark featuring the 1854 Pennsylvania Railroad horseshoe-shaped curve — covers railroad engineering history, civil engineering, and industrial-era transportation.

National park built around 47 thermal springs — covers geothermal geology, hydrology, and early federal conservation history.

Wyoming state park centered on geothermal hot springs and travertine terraces — covers geology, geothermal processes, and Wyoming ecosystems.

Geothermal hot-spring bath house in Wyoming state park — demonstrates geochemistry, hydrothermal geology, and mineral content of thermal waters.

Wyoming state park featuring the largest hot springs in the world — geothermal geology, thermophilic biology, and hydrological science.

Formal botanic garden with themed collections and educational programming covering plant biology and horticulture.

Interactive aquarium and animal preserve north of Houston with touch tanks and live animal encounters — marine biology, animal adaptation, and aquatic ecosystems.

Satellite branch of Houston's top-ranked natural science museum with geology, paleontology, and space science exhibits.

Ancestral Puebloan tower and cliff-dwelling ruins on the Utah-Colorado border — covers pre-Columbian archaeology and Native American architecture.

Living-history farm demonstrating 19th-century agricultural practices — covers pre-industrial farming, rural social history, and applied botany.

Omaha Zoo's gorilla habitat featuring one of the largest indoor gorilla exhibits in the U.S. — covers primate behavior, great ape biology, and conservation.

Dedicated orangutan habitat at Omaha's Henry Doorly Zoo — supports primate biology, conservation science, and animal behavior study.

Outdoor discovery campus in the Hudson Highlands offering guided ecology programs, wildlife observation, and natural-history interpretation.

State park nature center with hands-on exhibits and trail access — covers Ohio woodland ecology, wildlife biology, and environmental science.

Ohio state park with old-growth forest preserve, glacial lake, and naturalist programs covering forest ecology and glacial geology.

Vast Great Basin and Sierra Nevada national forest — covers high-desert and alpine ecology, geology, watershed science, and Nevada/California biogeography.

Nature center at Letchworth State Park offering ranger-led ecology programs, wildlife identification, and hands-on environmental science.

Working family farm offering seasonal crop tours and agricultural education — covers plant biology, food production, and farm ecology.