This is the famous Citadel on a mountaintop in Haiti build by Henri Christophe in 1805-1820 to deter France from attempting to reconquer Haiti. The loss of life in building the mountaintop redoubt was staggering. But no attempt was made to retake Haiti. The King shot himself with a silver bullet in 1820.
The biography of Henri Christophe was enfolded into the play The Emperor Jones by Eugene O'Neill. The extraordinary history of Haiti was probably better known in the U.S. many decades ago than it is today.