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Clues:
 * It took nearly thirty years to build this fort and it was never completely finished nor fully armed.
 * The is fort is also known as "The Guardian of the Gulf" due to its location along one the world’s busiest shipping lanes.
 * The Fort is located within the islands that make up the Dry Tortugas near Florida and was more valued for its safe harbor than its fortifications

Questions: 1. What is the name of the fort in the photographs? 2. What is the name of the National Park where the fort is located?

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