5. The Bermuda Triangle
The Bermuda Triangle is an infamous stretch of ocean in the western Atlantic, where numerous ships and aircraft are said to have vanished under mysterious circumstances. Despite decades of investigation, the causes behind these disappearances remain unclear. Ideas range from natural explanations like methane hydrate eruptions and unpredictable weather, to more exotic theories such as magnetic anomalies. None, however, fully resolve the mystery. The Bermuda Triangle continues to capture imaginations and spark debate. Dive deeper at National Geographic.