Adam Stephen House is a historic home located at Martinsburg, Berkeley County, West Virginia. It was built between 1772 and 1789, and is a 2 1/2 story, stone house measuring 43 feet, 5 inches, by 36 feet, 3 inches. It was the home of Adam Stephen (c. 1718 – July 16, 1791). Built of shaped limestone, it stands on a prominent stone ledge, with two outbuildings in stone and log. After falling into near-ruin, iIt was restored in the 1960s by the General Adam Stephen Memorial Association and is open as a historic house museum. The house was built over a natural cave, with stone steps leading down from the basement. A local caver's organization has worked since 2002 to excavate the cave, which had become plugged with earth, and the excavation is available for tours on open house days.