Why is "American Civil War fortifications in Louisville" trending?

Wikipedia Overview

Louisville's fortifications for the American Civil War were designed to protect Louisville, Kentucky, as it was an important supply station for the Union's fight in the western theater of the war. They were typically named for fallen Union officers; usually those that served in the Army of the Ohio. The inspiration for building the forts came in October 1862, when Confederate forces engaged in their largest attack in Kentucky, only to be halted at the Battle of Perryville. Construction began in 1863, going at a slow pace until Confederate forces marched on Nashville, Tennessee, in the autumn of 1864. This caused General Hugh Ewing to demand from the city to force both military convicts and local "loafers" to help build the fortifications. Due to military engineers being needed on the front lines, the fortifications in Louisville were designed by civilian assistant engineers, as were the ones in Cincinnati, Ohio. Louisville was never endangered, so the guns never fired, save for salutes.