As the United States industrialized in the late 1800's, old handmade tools and products were being replaced by mass-produced items. Henry Mercer began to collect these artifacts of the pre-industrial era and in 1916 build a concrete castle to house them. Today’s Mercer Museum in Doylestown, PA contains around 40,000 items including old tools, a stage coach, a Conestoga wagon, and other handmade objects. Join It’s History! on a tour of the nooks and alcoves of the Mercer Museum.