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Wikipedia: National Historic Landmarks in New York: Washington's Headquarters

For Students 9th - 10th
Headquarters of Washington during the final years of the Revolutionary War; Dutch stone house; oldest building in Newburgh; first-ever property designated as a historic site by a U.S. state.
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Wikipedia: Natl Historic Landmarks in Pennsylvania: Washington's Headquarters

For Students 9th - 10th
Part of Valley Forge National Historical Park.