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This historic site includes several structures. The most impressive is Fort Christiansvaern (1749), a four-point citadel occupying the deep-yellow buildings on the town’s east side. Built out of Danish bricks (brought over as ships’ ballast), the fort protected citizens from the onslaught of pirates, hurricanes and slave revolts. Cannons on the ramparts, an echoey claustrophobic dungeon and latrines with top-notch sea views await inside. The fort entrance has brochures for self-guided exploration of the other nearby historic buildings.