The tabby Stoney-Baynard Ruins (Plantation Dr., dawn–dusk, free) in Sea Pines are what remains of the circa-1790 central building of the old Braddock’s Point Plantation, first owned by Patriot and raconteur Captain “Saucy Jack” Stoney and then the Baynard family.
Active during Hilton Head Island [1]’s heyday as a cotton center, the plantation was destroyed after the Civil War. Site interpretation here is barebones, but suffice it to say that this is a great remaining example of colonial tabby architecture.
Two other foundations are nearby, one for slave quarters and one whose use is still unknown. Note that there is that $5 fee to enter Sea Pines.
Links:
[1] http://www.moon.com/destinations/south-carolina/beaufort-and-the-lowcountry/hilton-head-island