Duffield performed construction review services for the newly constructed Museum of the American Revolution in Old City Philadelphia, two blocks away from Independence Hall and the Liberty Bell. The museum took two years to construct and opened in April 2017. One of the interesting parts of this project was an archeological excavation which was performed during the basement excavation. The National Parks building, which was removed to clear the site for the museum construction, had been built over the old houses which dated to the 1700’s. As part of the excavation for the new foundations which extended to as much as 20 feet below the streets, archeologists exposed the old structures and removed artifacts for months before foundations were constructed.