Oak Hill Estate, also known as Mt. St. Macrina and Fox Hill, is a historic estate located at North Union Township, Fayette County, Pennsylvania. On the property are seven contributing buildings, four contributing sites, and one contributing structure. The estate was developed in 1903, by coal baron J.V. Thompson, an associate of Henry Clay Frick. The estate was conceptualized by architect Daniel Burnham. The mansion is a 3-story, 42-room, 18,313 square foot, brick building in the Classical Revival style. Other contributing buildings include the a smaller residence built for Thompson's son, a pool house, carriage house / stable, pumphouse, schoolhouse / servant's quarters, and garage. The contributing sites and structure are the Springer cemetery (c. 1840), west gate and drive, stone wall,