The Ulster American Folk Park is an open-air museum in Castletown, just outside Omagh, in County Tyrone, Northern Ireland. The Park explores the historical link between Ulster and America, focusing particularly on the lifestyle and experiences of those immigrants who sailed from Ulster to America in the 18th and 19th centuries. It is one of the four museums included in National Museums Northern Ireland grouping. The park includes Mellon House, the birthplace of Irish-American banker and lawyer Thomas Mellon. The house and outbuildings remain in their original location.