The National Park Service offers free admission to all parks, monuments and historic sites that normally charge an admission fee on certain days in 2019.
January 21, Martin Luther King Jr. Day, April 20 – First Day of National Park Week & National Junior Ranger Day, August 25 – National Park Service Anniversary September 28 National Public Lands Day and, November 11 – Veterans Day
These FREE admission days include Fort Moultrie National Monument near Charleston. Admission to Fort Sumter National Monument is always free although there is charge for the private ferry service to/from the fort. 843-883-3123.