Light's Fort was built in 1742 by Johannes Leicht [John Light]. It is the oldest standing building in the county and city of Lebanon, Pennsylvania, United States. Intended for use as a shelter for local settlers during Native American attacks, its stone construction and tile roof made it impervious to fire. In addition to being John Light's homestead, the building later served as a distillery, a meeting house, and a warehouse. Tunnels beneath the building ran under the town of Lebanon, allowing access to other residences in the community. Ongoing renovations by the Historic Preservation Trust of Lebanon County will preserve the structure and maintain its 18th-century appearance.