Gullfoss, Iceland

Gullfoss roars through a 32-metre deep crevice in Iceland's Hvítá river with glacial meltwater averaging 140 cubic metres per second, creating a perpetual rainbow in summer under the subarctic sun. Its two-tier drop spans 32 metres total, which is 50% shallower than the average plunge of the top 10 list, yet its thunderous acoustic presence rivals #7 Detian Falls in sheer dramatic force. The combination of raw power and rare optical effect places it among the world's most photogenic cascades.