Edinburgh Castle Tower
Anyone who travels to Edinburgh, Scotland will find Edinburgh castle a tower of seemingly insurmountable strength. But the truth is that the castle was once actually captured. The fortress had an obvious weak spot which defenders guardedbut because another spot was apparently protected by its steepness and impregnability, no sentries were posted there. At an opportune time, an attacking army sent a small band up that unguarded slope and surprised the garrison into surrender. Where the castle was strong, there it was weak.