Historian explains little-known link between medieval castles and American forts

Historian and author Dan Jones tells Fox News Digital how America's historic military forts evolved from medieval castles, revealing a surprising connection between European fortresses and American history.

Historian and author Dan Jones, whose new book is "Castles," tells Fox News Digital how castles have served as symbols of wealth, power and protection for thousands of years, from medieval strongholds to America's grand estates and modern fortifications.