Classified for credit

One of California's longest covered bridges still standing — 19th-century Civil War-era bridge engineering and Gold Rush-era transportation history.

Living-history campus in San Jose's Kelley Park with preserved Victorian-era buildings covering California and Silicon Valley social history.

Museum exploring the history of Hollywood film and entertainment industry — media literacy, film history, and 20th-century popular culture.

City-maintained arboretum with labeled tree and plant collections — supports dendrology, plant taxonomy, and local ecology studies.

Federally managed coastal refuge supporting shorebird and waterfowl populations — covers estuarine ecology, migratory biology, and Pacific Flyway geography.

Coastal dune unit of Humboldt Bay NWR — covers dune ecology, coastal geomorphology, and Pacific Flyway migratory bird biology.

County-run nature center in the San Jacinto Mountains — covers Southern California mountain ecology, native flora/fauna, and natural history through ranger-led programs.

CA state historic park with bedrock mortars and Miwuk cultural site — Native American archaeology, ethnobotany, and pre-contact history.

Fine-art museum with rotating exhibitions of painting and sculpture spanning multiple centuries and international traditions.

Physical archive of the Internet Archive in Richmond — covers digital preservation, computer history, and information science.

Large Orange County regional park with wildlife areas, trails, and a small zoo — covers California wildlife ecology, native habitats, and outdoor physical education.

California Historical Landmark gold-rush town — covers California's 1849 Gold Rush, mining history, and westward migration.

Small California Gold Rush-era museum in a historic Sierra Nevada town covering mining history, 49er culture, and early California statehood.

Historic Japanese garden within Golden Gate Park — covers traditional landscape design, Japanese cultural history, and plant ecology.

Gallery in San Francisco's Japantown documenting Japanese-American history, WWII incarceration, and cultural heritage.

Jelly Belly factory tour (retail store location) showing candy manufacturing — covers food science, quality control, and production processes.

College-operated planetarium with public shows — covers celestial mechanics, cosmology, and observational astronomy.

National Historic Trail tracing the 1775–76 Spanish colonial expedition from Mexico to San Francisco — covers exploration history, geography, and California founding narratives.

Coastal Mendocino County farm and nature center with trails and ecology programs covering California coastal habitat and sustainable land stewardship.

Historic Sierra Nevada hard-rock gold mine and museum — covers mining geology, mineralogy, and California Gold Rush industrial history.

San Joaquin Valley national wildlife refuge protecting wetland habitat for migratory waterfowl — covers Central Valley ecology, bird migration, and wetland conservation.

Riparian nature center along the Kern River — covers Central Valley wildlife, river ecology, and native plant identification through trails and ranger programs.

River-corridor nature center along the Kern River — covers riparian ecology, Central Valley bird habitats, and local watershed science.

Historic Desert Queen Ranch in Joshua Tree — covers early 20th-century homesteading, water management, and Mojave Desert settlement history.