Complete guide to Castillo de San Marcos National Monument in St. Augustine, Florida including things to do, history, pa ...

St. Augustine is commonly referred to as the 'Nation's Oldest City, ' but did you know it has eight castles? Here's where to ...

According to the National Park Service, the Castillo de San Marcos measures 1,355 linear feet. The seawall consists of five sections: North, North Transition, Center, South and South Transition.

According to the National Park Service, the Castillo de San Marcos measures 1,355 linear feet. The seawall consists of five sections: North, North Transition, Center, South and South Transition.

As the National Park Service celebrates its 100th anniversary this week, St. Augustine's Castillo de San Marcos is being recognized for its place among America's most important historic buildings.