Ferns grow in hollows made in the ground by collapsed coffins. This is all that remains of the Trenis family cemetery near the ruins of their house, Landsdown, located on what is now the west side of Marine Corps Base Quantico. - Ferns grow in hollows made in the ground by collapsed coffins. This is all that remains of the Trenis family cemetery near the ruins of their house, Landsdown, located on what is now the west side of Marine Corps Base Quantico.