For centuries, European explorers sought the Northwest Passage—a sea route through the Arctic Archipelago of present-day Canada—believing it would provide a direct navigable link from the Atlantic to the Pacific Ocean.
Why it mattered:
Reality: The passage exists but was blocked by thick sea ice most of the year. Roald Amundsen first traversed it entirely by ship (1903–1906). Today, climate change is reducing ice cover, increasing summer navigability, and renewing geopolitical and commercial interest—but it remains a challenging, environmentally sensitive route, not a regular commercial artery.