Classified for credit

Mammoth Cave National Park, the world's longest known cave system, offers ranger-led tours covering speleology, geology, and karst hydrology.

Active paleontological dig site where Columbian and woolly mammoth remains are excavated in situ — covers paleontology, Pleistocene geology, and Ice Age ecology.

NPS-managed Civil War battlefield (First and Second Bull Run) with visitor center, ranger programs, and preserved earthworks.

Major hands-on science center in Baltimore's Inner Harbor — covers physics, astronomy, earth science, and biology through interactive exhibits and an IMAX dome.

Working research observatory in the Davis Mountains with public star parties and visitor programs — astronomy, optics, and astrophysics observation.

Major hands-on science center — physics, chemistry, biology exhibits and an IMAX dome.

Ancestral Puebloan cliff dwellings at a UNESCO World Heritage Site — covers pre-Columbian archaeology, Native American history, and Colorado Plateau geography.

Best-preserved meteorite impact crater on Earth with visitor center and museum — covers planetary geology, impact physics, and astrogeology.

Large natural-history and anthropology museum with immersive dioramas, fossil halls, and a working butterfly vivarium — covers geology, biology, and world cultures.

Major encyclopedic art museum with collections spanning world cultures and centuries — art history, visual analysis, and cross-cultural studies.

National historical park commemorating the opening battles of the American Revolution — primary-source military history and colonial civics.

Major botanical garden with 79 acres of curated plant collections — plant biology, taxonomy, ecology, and conservation science.

World-class aquarium on Monterey Bay — marine biology, ocean ecology, food webs, and conservation science across dozens of exhibit halls.

Thomas Jefferson's plantation home and gardens — covers Founding Era history, Enlightenment philosophy, plantation agriculture, and the history of American slavery.

Working marine research laboratory and public aquarium — marine biology, shark research, sea turtle rehabilitation, and coastal ecology.

Active stratovolcano national park with ranger programs covering glaciology, alpine ecology, and Pacific Northwest geology.

Colossal presidential sculpture carved into granite — covers American political history, monument engineering, and Lakota cultural context.

George Washington's estate on the Potomac — primary-source American founding history, plantation agriculture, and 18th-century domestic life.

National Monument preserving old-growth coastal redwoods — covers forest ecology, dendrology, and conservation biology via ranger-led programs.

Open-air living-history complex with 35+ log buildings and 250,000+ Appalachian artifacts covering 18th–20th century mountain life and material culture.

Major aviation and space museum with 175+ aircraft including Air Force One and a Concorde — aeronautical engineering, aerospace history, and flight physics.

Major science center with hands-on exhibits across physics, engineering, biology, and space — one of the largest science museums in the US.

Major museum in Philadelphia with immersive exhibits on the American Revolution — primary-source history, civics, and the founding era.

Major natural-history and paleontology museum with extensive dinosaur collection and living-history exhibits — vertebrate paleontology, geology, and evolutionary biology.