My brother was kind enough to send me a link to this website describing Nike Park, located on the Isle of Wight on the Virginia coast.
The local parks commission has repurposed the buildings as their headquarters, and has thereby preserved them.
If you listen to the attached video, the narrator gives a history of the defenses on the island dating back to the colonial period. His perspective on the Civil War is somewhat unique. Eventually the last third of the narrative is on the Nike site with some memories shared from a soldier who was stationed there.
The photo is from the same webpage.