High Quality Content by WIKIPEDIA articles! The Moravian Pottery Tile Works (MPTW) is a history museum located in Doylestown, Pennsylvania. It is maintained by the County of Bucks, Department of Parks and Recreation. 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 Mercer Museum and Fonthill. These three structures are the only poured-in-place concrete structures built by Mercer.