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Independence Hall is the red-brick Georgian building where both the Declaration of Independence and the U.S. Constitution were debated and adopted. A UNESCO World Heritage Site since 1979, it is the most historically significant building in the United States.
Built in 1753 as the Pennsylvania State House, the building hosted the Second Continental Congress (1775–1783) and the Constitutional Convention (1787). It served as Pennsylvania's capitol until 1799 and was designated a National Historic Landmark in 1966.