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Completed in 1713, the Powder Magazine was built for gunpowder storage. It is the oldest public building in the Carolinas and one of the few remaining military structures associated with the 1780 British Siege of Charles Town. The Powder Magazine is a visible reminder of the proprietary era, the founding of the government of the Carolinas, and the fortifications which protected Charles Town. The restored magazine is a National Historic Landmark with exhibits about colonial military history.