Castle Thunder, located between what is now 17th Street and 18th Street on northern side of E Cary Street in Richmond, Virginia, was a former tobacco warehouse in three buildings, located on Tobacco Row, converted into a prison pursuant to an order of Richmond's provost-marshal John Winder by August 1862. The Confederacy there housed civilian prisoners, including captured Union spies and deserters, political prisoners and those charged with treason during the American Civil War.