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Locust Grove, also known as the Haldeman Mansion, is a historic home located at Conoy Township in Lancaster County, Pennsylvania. It was built about 1782, and is a large, two-story, four bay by two bay stone dwelling overlooking the Susquehanna River. It has a massive central chimney Also on the property is a rectangular, two story stone building with a hipped gable roof. The mansion was completed in 1811. It is the birthplace of Samuel Haldeman, noted scientist.