The Cannonball House on Front Street is a late 18th-century captain's house that took a hit during the 1813 War of 1812 bombardment and never quite let go. The British, blockading Delaware Bay, demanded the town surrender provisions. The town refused. The Royal Navy spent two days lobbing shot at Lewes; most of it missed or did little damage, but several cannonballs hit houses, and the one in the foundation of this house is the most visible.
The building is now the Lewes Maritime Museum, run by the historical society, with exhibits on the bombardment, the town's shipbuilding history, and the wrecks that have piled up off the cape over four centuries. Hours are limited — typically afternoons in summer — but the cannonball itself is visible any time you walk past.