Classified for credit

Marine mammal exhibit at the National Aquarium — covers cetacean biology, marine mammal physiology, and conservation science.

Marine science center at Ponce Inlet with touch tanks and estuary exhibits — covers Atlantic coastal ecology, sea turtle biology, and Florida marine ecosystems.

Victorian-era indoor conservatory with tropical and desert plant collections — covers plant taxonomy, biomes, and photosynthesis.

Restored boyhood home and museum of Mark Twain in Hannibal, MO — covers 19th-century American literature, frontier childhood, and primary-source biography.

Restored Victorian home of Samuel Clemens with guided tours — covers 19th-century American literary history, social reform, and the life of Mark Twain.

Site of the 1848 gold discovery that triggered the California Gold Rush — covers westward expansion, California statehood, and 19th-century economics.

Museum at the C.F. Martin Guitar factory covering instrument-making history, acoustic science, and American craft manufacturing since 1833.

NPS site preserving MLK Jr.'s birthplace and civil rights landmarks — primary-source 20th-century American history and civics.

Isolated Columbia Gorge art museum housing Rodin sculptures, Native American art, and European collections — covers art history, sculpture, and Pacific Northwest heritage.

Major Maryland history museum with collections spanning colonial through 20th-century history — supports Maryland state history and US history curriculum.

Oldest continuously operating state capitol in the US and site where Congress ratified the Peace of Paris (1784) — covers constitutional history and civics.

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

Large-scale Pequot tribal museum with life-size recreations and archaeological exhibits — covers Native American history, culture, and pre-colonial New England.

Mass Audubon sanctuary on Cape Cod with salt marsh, tidal flat, and coastal pine habitat — marine ecology, bird biology, and conservation science.

Major contemporary art museum in repurposed mill buildings — covers modern and contemporary art movements, installation art, and interdisciplinary creative practice.

Marine science aquarium operated by a community college — features Puget Sound marine life, touch tanks, and exhibits on Pacific Northwest aquatic ecosystems.

State historic site preserving a mastodon excavation — covers Pleistocene paleontology, Ice Age megafauna, and the archaeological record of early human presence in Missouri.

Drive-up access to one of Alaska's largest accessible glaciers — covers glaciology, geomorphology, and climate science firsthand.

University-affiliated math and science enrichment center — hands-on STEM exhibits covering mathematics, physics, and applied sciences.

Living-history farm museum in Galax, VA demonstrating 19th-century Appalachian agricultural practices — hands-on pioneer farming, craft, and rural social history.

Illinois state park with canyon formations, waterfalls, and diverse forest ecosystems — supports geology, ecology, and physical education.

Illinois canyon state park with canyons, waterfalls, and rock formations — geology, erosion, and riparian ecology in a hands-on outdoor setting.

Contemporary art museum occupying a former mattress factory — installation art and site-specific works across multiple floors.

Maui aquarium featuring native Hawaiian marine life — covers Pacific Ocean ecology, coral reef biology, and local conservation.