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The Spiral Tunnels are a marvel of early Canadian engineering and one of the most fascinating railway stories in the country. Built between 1907 and 1909 by the Canadian Pacific Railway to conquer the fearsome grade of Kicking Horse Pass, these two figure-eight tunnels are bored directly through the mountains. From dedicated viewpoints, lucky visitors can watch freight trains entering and exiting the tunnels simultaneously — a spectacular sight as the locomotive emerges from one portal while the tail end of the same train is still entering another. Interpretive panels at the viewpoints tell the dramatic story of the tunnels’ construction and the bold engineers who made it possible. It’s a surprisingly thrilling stop that brings Canadian railway history alive in a vivid and unforgettable way. The Spiral Tunnels are a true engineering wonder hidden in the heart of the Rockies.