"Walnut Grove", also known as the Andrew Beirne House, is a historic home located near Union, Monroe County, West Virginia. It is a "T" shaped dwelling that integrates four separate structures. The oldest date to the 1780s and incorporates two, two-story log buildings. Attached to them is a formerly detached log kitchen. A two-story, Greek Revival-style brick addition was built after 1825. The entrance is in this section and features a one-story porch supported by square columns. Also on the property are a two-room frame office building, brick smokehouse, and stone springhouse. It was home to U.S.