By a February 14, 1949 decree the site was established, and noted the need to protect the fortifications as monuments as well as preserve their historical and architectural value. Listed on the National Register of Historic Places on October 15, 1966.
On December 6, 1983 the park was added to the list of World Heritage Sites, a status shared with the Great Wall of China and the pyramids in Egypt. Only 12 national park areas in the United States are considered World Heritage Sites.
The site is open to visitors year-round.
There is a fee for entering the forts at the site ranging from US$3 for adult access to one fort for 1-day to US$5 for adult access to all forts for up to 7-days.