Classified for credit

One of the oldest natural science museums in the US — covers paleontology, mineralogy, ornithology, and ecology through extensive specimen collections.

Major natural history museum with extensive fossil, gem, and anthropology halls — covers paleontology, geology, evolutionary biology, and human origins.

Frank Lloyd Wright's Fallingwater is a National Historic Landmark illustrating organic architecture, engineering design principles, and 20th-century design history.

Major hands-on science center covering physics, astronomy, engineering, and human biology with a full-size locomotive and Fels Planetarium.

Civil War battlefield with NPS visitor center, cyclorama, and ranger-led programs — covers military strategy, the turning point of the war, and Reconstruction.

UNESCO World Heritage Site where the Declaration of Independence and Constitution were debated and adopted — primary-source American founding history and civics.

NPS-managed park preserving Independence Hall, Liberty Bell, and core sites of American founding — primary-source Constitutional history.

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

Major encyclopedic art museum with works spanning antiquity to contemporary — supports art history, social studies, and visual-arts analysis.

America's first zoo with strong conservation programs — covers zoology, animal behavior, and biodiversity across hundreds of species.

NPS site with a working roundhouse and restored steam locomotives — covers railroad history, steam-engine mechanics, and industrial-era social history.

Hands-on science center in Allentown covering physics, engineering, biology, and technology through interactive exhibits and programs.

National recreation area spanning the Delaware River corridor — river ecology, watershed biology, and Appalachian geography with ranger programs.

National Recreation Area along the Delaware River — river ecology, watershed science, and Appalachian geography with NPS ranger programs.

NPS recreation area protecting 70,000 acres of Delaware River gorge — covers river ecology, glacial geology, watershed biology, and riparian habitats.

Preserved narrow-gauge railroad with operating steam locomotives — covers 19th-century industrial history, rail engineering, and Appalachian heritage.

Eisenhower's retirement home and working farm in Gettysburg — covers WWII leadership, Cold War presidency, and 1950s American political history.

Maritime museum on Presque Isle Bay featuring the brig Niagara — covers naval history of the War of 1812, ship construction, and Great Lakes commerce.

Home of the reconstructed US Brig Niagara — covers War of 1812 naval history, 19th-century sailing technology, and Great Lakes maritime heritage.

National memorial to the 40 passengers who thwarted the 9/11 hijacking — covers modern U.S. history, civic courage, and primary-source analysis.

Factory tour and interactive attraction at Hershey showing cocoa-to-chocolate production — covers food science, manufacturing, and agricultural supply chains.

Restored 18th-century iron furnace complex with living-history demonstrations covering colonial iron production, industrial history, and metallurgy.

National memorial at the site of the 1889 Johnstown Flood — covers disaster history, dam engineering failure, civil engineering, and 19th-century industrial community life.

Guided tours of active limestone caverns in central Pennsylvania — covers geology, speleology, cave formation, and karst hydrology.