"The original structure was built in 1859 and rebuilt in 1875 after it was destroyed during the Civil War. A unique feature of the lighthouse is that it was constructed of interchangeable cast-iron sections so it could be dismantled should it ever need to be moved. Severe beach erosion made it necessary to relocate the lighthouse 1.3 miles inland in 1889."
https://southcarolinaparks.com/hunting-island/lighthouse