THOMAS Barclay's, circa 1765, Georgian mansion was Washington's headquarters, Dec 8-14, 1776. Declaration of Independence and Constitution signers, Robert Morris, "Financier of the Revolution," then George Clymer, were subsequent owners. This restored National Historic Landmark. Welcome groups. Hours: 1st Sat 10 am-1 pm - No charge. Groups are by appointment - $2.00/person.