Castillo de San Marcos is St Augustine's lasting landmark of the first Spanish colonial era and is the oldest masonry fortification in continental America. Other historic highlights include the 19th-century St Augustine Lighthouse and Maritime Museum and the historic downtown, where many of the buildings date back to the 1700s.

In a different vein, the Fountain of Youth Archaeological Park tells the story of Spanish explorer Ponce de Leon's legendary quest for the magical waters of the fountain of youth, and the tragedy of the Indigenous Timucua people.

Now marvel at the most powerful photos ever taken in US history

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What You Didn’t Know About America’s Oldest Cities