There were several abandon structures on the island. This is the old play ground of the rich and famous.
Next to the shack I found these little gems.
According to the Cumberland Island website. http://cumberlandisland.com/the-island/history/
In the early 1880s, Thomas Morrison Carnegie and his wife, Lucy Coleman Carnegie, came to the Island and established the family’s presence, which exists to the present day. In the 1960s the human population began to diversify somewhat as the land started to leave the exclusive holdings of individual families, and the evolution of the National Seashore began.