Classified for credit

Bureau of Reclamation visitor center at one of the world's largest concrete dams — covers dam engineering, hydroelectric power, and water management.

Working 1,400-acre farm and conservation education center — covers sustainable agriculture, animal husbandry, cheesemaking, and land stewardship.

Shelby American automotive collection displaying race-built performance cars — covers mechanical engineering, aerodynamics, and American motorsport history.

Downtown aquarium with freshwater and marine exhibits — fish taxonomy, aquatic ecosystems, and water-quality science.

Florida Silver River museum and environmental education center adjacent to a spring-fed river — covers Florida ecology, natural history, and conservation biology.

State-of-the-art orangutan habitat at Indianapolis Zoo — covers great-ape behavior, primate biology, and conservation science.

Marine science center and salmon hatchery on Sitka Sound — fish biology, aquaculture, Southeast Alaska ecology, and ocean science.

Museum with over 300 real animal skeletons — covers vertebrate anatomy, comparative osteology, and biological diversity across species.

Dark-sky observatory and nature center adjacent to Joshua Tree NP — covers astronomy, Mojave desert ecology, and dark-sky science.

103rd-floor glass-floor observation deck of Willis Tower — covers structural engineering, skyscraper construction, and urban geography of Chicago.

Rotunda museum at Lowell Observatory where Pluto was discovered — covers planetary science, telescope history, and the history of astronomy.

Flint-based discovery museum with hands-on science and local history exhibits — covers physical science, technology, and regional industrial history.

Preserved 19th-century iron blast furnace complex — covers metallurgy, industrial chemistry, and the history of iron and steel production.

Smithsonian National Zoo building dedicated to small mammals — mammalian biology, adaptation, and nocturnal animal behavior.

Sacramento's hands-on science center with exhibits on energy, earth science, and technology, funded by the regional utility SMUD.

Overlook within Hagerman Fossil Beds NM — covers Pliocene-era paleontology, fossil horse discovery, and Snake River Canyon geology.

Lower observation deck of a 270-foot waterfall adjacent to a working Puget Power hydroelectric plant — covers hydrology, erosion, and electricity generation.

Mountain-top observatory and planetarium accessible by gondola — covers astronomy, atmospheric science, and high-altitude geography.

Indoor ocean aquarium with live marine exhibits — supports marine biology, ocean ecology, and animal adaptation study.

Working navigational locks on the St. Marys River — demonstrates hydraulic engineering, water-level mechanics, and Great Lakes shipping history.

Children's museum near the Soo Locks featuring hands-on exhibits on shipping and lock engineering — covers civil engineering, hydraulics, and Great Lakes commerce.

Indoor butterfly conservatory at Faust Park with live tropical species and a chrysalis emergence chamber — covers lepidopteran life cycles and entomology.

SD Air & Space Museum at Ellsworth AFB — aviation engineering, Cold War missile history, and B-1 bomber exhibits.

Hands-on science center for children and families — interactive STEM exhibits covering physics, engineering, and natural science.