I'll have to put this one in the list of Confederate forts I didn't know about.
The Nov. 12th New Orleans Times-Picayune reports that the Third Annual Camp Parapet Day will be tomorrow and visitors will be allowed a rare visit into the Civil War magazine.
It was part of the Confederate fortifications built in 1861 to protect the city, and these specifically to guard the northern approach along the Mississippi River. The zig-zag earthen embankments run from the river to Lake Pontchartrain, roughly parallel to the current Causeway Boulevard about a mile upriver from the city's present day boundary.
It didn't helped the Confederacy at all as the city was taken from the south, but after occupation, Union troops manned and expanded the works.
One I Didn't Know About. --B-R'er