Classified for credit

Large accredited zoo with strong conservation programs covers vertebrate zoology, animal adaptation, and global ecosystems across 80+ acres.

Major botanical garden specializing in Sonoran Desert flora — plant adaptations, desert ecology, and ethnobotany with labeled specimens throughout.

AZA-accredited zoo with strong conservation programming covering animal biology, global biodiversity, and wildlife conservation ethics.

Large accredited zoo with strong conservation programming — covers zoology, animal behavior, global biodiversity, and wildlife conservation.

Remote island national park with coral reef ecosystems and Fort Jefferson — covers marine biology, ecology, and 19th-century coastal fortification history.

UNESCO World Heritage subtropical wilderness covering mangrove ecology, wetland hydrology, and endangered species conservation with ranger-led programs.

World-class tropical botanical garden with 83 acres of collections — covers plant taxonomy, tropical ecology, conservation biology, and ethnobotany.

AZA-accredited zoo with strong conservation programs — covers zoology, animal behavior, and wildlife biology across diverse biomes.

Drive-through wildlife center with native and exotic species conservation programs — covers zoology, ecology, and endangered-species biology.

Remote Arctic wilderness preserve covering subarctic ecology, boreal biology, and arctic geography; visitor center in Fairbanks provides orientation.

Gibbon Ridge is part of the National Zoo grounds in Washington, DC — animal behavior, zoology, and conservation biology in a world-class setting.

UNESCO World Heritage Site and national park with tidewater glaciers — covers glaciology, marine ecology, and Pacific coastal geography.

National park and UNESCO World Heritage Site — tidewater glaciology, marine ecology, and coastal geography with ranger-led programming.

National park with active glaciers, alpine ecosystems, and ranger-led programs covering glaciology, ecology, and Rocky Mountain geography.

NPS recreation area spanning bay, coast, and redwood habitats — covers ecology, coastal geography, Civil War fortifications, and outdoor fitness.

One of the world's great geologic wonders — covers erosion, stratigraphy, river systems, and ecology across 277 miles of canyon.

National park featuring the Teton Range, Jackson Lake, and diverse wildlife — covers geology, ecology, and Rocky Mountain geography.

Remote Great Basin NPS unit with Lehman Caves, ancient bristlecone pines, and a dark-sky program — covers geology, ecology, and astronomy.

National park featuring North America's tallest sand dunes — covers aeolian geology, hydrology, and high-desert ecology with ranger programming.

UNESCO World Heritage site and one of the most biodiverse temperate forests in North America — covers ecology, geology, and Appalachian natural history.

Remote national park exposing ancient Permian reef geology and Chihuahuan Desert ecology — covers stratigraphy, desert biology, and physical geography.

Active shield volcano summit and crater in a national park — covers volcanology, atmospheric science, Hawaii ecology, and high-altitude biology.

State-protected marine preserve featuring a reef ecosystem accessible by snorkeling — covers marine biology, coral ecology, and Hawaiian coastal conservation.

The Big Island of Hawaii provides direct field study of active volcanology, tropical ecology, marine biology, and Pacific island geography.