Mercer Museum

The Mercer Museum is a museum located in Doylestown, Pennsylvania. The Bucks County Historical Society operates the Mercer Museum, the Research Library, and Fonthill Castle, the former home of the museum's founder, archeologist Henry Chapman Mercer.

The museum was individually listed on the National Register of Historic Places in 1972, and was later included in a National Historic Landmark District along with the Moravian Pottery and Tile Works and Fonthill. These three structures are the only poured-in-place concrete structures built by Mercer.

Source: Wikipedia