Classified for credit

Big Sur coastal state park featuring historic 19th-century lime kilns alongside redwood forest and marine ecology — blends industrial history with coastal biology.

Commercial cave tour in Pennsylvania — covers karst geology, speleothem formation, and groundwater hydrology in an accessible underground setting.

Guided tours of active limestone caverns in central Pennsylvania — covers geology, speleology, cave formation, and karst hydrology.

Hands-on children's museum with interactive literacy, math, and STEM exhibits designed for early and elementary learners.

NPS-managed Lincoln family home and neighborhood restored to 1860s appearance — covers Abraham Lincoln's pre-presidential life and Illinois history.

NPS visitor center for Lincoln's Springfield home neighborhood — covers Lincoln's pre-presidential life, antebellum Illinois, and the Civil War era.

Working farm recreation of Thomas Lincoln's homestead — living-history interpretation of 1840s prairie life and Lincoln's formative years.

Illinois state historic site housing Abraham Lincoln's tomb — primary-source presidential history, Civil War era, and Illinois heritage.

State historic site marking the burial place of Abraham Lincoln — covers Lincoln's presidency, Civil War history, and American memorialization traditions.

Reconstructed 1830s Illinois village where Lincoln lived — living-history interpretation covers frontier settlement, Lincoln's early biography, and antebellum society.

Reconstructed 1830s frontier village where Lincoln lived as a young man — early American settlement, frontier economy, and Lincoln's formative years.

Wildlife rehabilitation center housing non-releasable native animals — raptor biology, wildlife medicine, and California native species ecology.

Guided tours through active limestone caverns in the Blue Ridge Mountains — covers speleology, karst geology, and cave ecosystem biology.

Nonprofit lion sanctuary in Henderson offering guided tours — large-cat biology, wildlife conservation, and captive animal welfare education.

NPS battlefield site of the 1876 Battle of Little Bighorn — covers Plains Indian history, U.S. military history, and Westward Expansion.

National monument battlefield with visitor center covering the 1876 Battle of Little Bighorn, Plains Indian history, and U.S. Army campaigns.

Chalk badlands with exposed Niobrara limestone formations — covers paleontology, erosion, stratigraphy, and western Kansas geology.

North Dakota badlands state park with rugged buttes and native grassland — supports Great Plains geology, prairie ecology, and physical geography.

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

NPS site at the school central to the 1957 desegregation crisis — covers Civil Rights history, constitutional law, and federal vs. state authority.

AZA-accredited zoo with diverse animal collection — covers zoology, wildlife conservation, and animal adaptation across multiple biomes.

Critical Gettysburg battlefield position with interpretive signage — covers July 2, 1863 fighting, Union defensive tactics, and Civil War military geography.

FDR's personal retreat and the site of his death in 1945 — covers the New Deal era, presidential history, and the impact of polio on public life.

Living-history museum with two working farm sites spanning 1860–1890 Colorado settlement — covers pioneer agriculture, community life, and local regional history.