Flounders' Folly is a tower, built in 1838, on Callow Hill, between Craven Arms and Ludlow, Shropshire, England. The tower is approximately 80 feet (24 m) tall and 16 feet (4.9 m) square and is clearly visible (on the skyline) from the Cardiff-Crewe railway line, just north of Craven Arms and also from the busy A49 Shrewsbury to Hereford road. The folly is sometimes mistaken for a fire-tower.