It is called the Zion Chapel of Ease Cemetery although the chapel was destroyed prior to 1868.
The mausoleum was vandalized during World War II and the cast iron coffins of William E. Baynard and his wife Catherine were thrown into the nearby marsh.
William E. Baynard
Catherine Adelaide Scott Baynard
(Many thanks to Dickie who helped me overcome technical difficulties to save these photos from a disk malfunction.)