The Castillo de San Marcos is open to the public every day of the year except Thanksgiving Day (fourth Thursday in November) and Christmas Day (December 25). First admission is at 9:00 am and last admission is at 5:00 pm. PLEASE NOTE: All visitors must exit the Castillo no later than 5:15 p.m. The park grounds are closed from midnight until 5:30 am.
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