Classified for credit

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.

Reconstructed French and Indian War fort with museum — covers 18th-century colonial warfare, frontier strategy, and Pennsylvania settlement.

Site of Gen. Robert E. Lee's headquarters during the Battle of Gettysburg — primary-source Civil War command history and battlefield geography.

Gettysburg museum and visitor center adjacent to the battlefield — covers Civil War tactics, turning-point analysis, and the significance of the Gettysburg Address.

Living-history reenactment field near Gettysburg — reinforces Civil War tactics, battlefield geography, and primary-source military history.

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

National Historic Landmark featuring the 1854 Pennsylvania Railroad horseshoe-shaped curve — covers railroad engineering history, civil engineering, and industrial-era transportation.

Philadelphia museum with historic ships and maritime exhibits — covers naval history, shipbuilding, and Delaware River commerce.

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

Living-history village preserving Pennsylvania German rural life — covers 18th–19th century agricultural history, trades, and material culture.

Critical Gettysburg battlefield position with interpretive signage — covers July 2, 1863 fighting, Union defensive tactics, and Civil War military geography.

Oldest-known archaeological site in North America with a living-history village — covers pre-Columbian archaeology, stratigraphy, and early American settlement.

Henry Mercer's concrete castle housing pre-industrial tools and trades — early American craft history, archaeology, and material culture.

Thirty decorated classrooms at the University of Pittsburgh representing world cultures — covers world history, immigration, architecture, and cultural geography.

Heritage railroad offering excursion rides on historic New Hope & Ivyland line — covers 19th-century railroad history and early American transportation.

Living-history village with 40+ historic structures and costumed interpreters — 18th–19th century Pennsylvania frontier and colonial American life.

Preserved 19th-century utopian Harmony Society village — living-history site covering communal religious settlement, early American industry, and social history.

University of Pennsylvania's archaeology and anthropology museum with primary artifacts from Egypt, Mesopotamia, and the ancient Mediterranean world.

Preserved electric streetcar collection with operating rides — covers transit history, electrification, and urban development.

Operating living-history farm demonstrating 18th–19th century Pennsylvania German rural life — covers agricultural history, domestic crafts, and Colonial-era social studies.

Museum dedicated to Pennsylvania Railroad history in Altoona — covers steam and diesel locomotive engineering, labor history, and the role of rail in U.S. industrialization.

Operating electric trolley museum with vintage streetcar rides — covers transportation history and early electric rail technology.