From strange lights in the sky to mysterious aircraft maneouvres, explore Europe's unreported and unexplained UFO history. This is the latest episode in National Geographic's new UFO series — UFOs: The Untold Stories.

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The World Economic Forum is a Swiss non-profit foundation, based in Cologny, Geneva. Every year, the organization publishes a report on global risks that could threaten the planet as a whole, such as extreme weather conditions, worldwide economic difficulties, health-related crises etc.

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Passengers on a morning flight from Cairns to Papua New Guinea were amazed to see the creature clinging to the aircraft's wing after take off. Exceptional footage.

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A series of mysterious booms were heard over Indianapolis, USA around 00:14 (12:14 am) on January 7, 2013. Officials say there were three big ones in total. The eyewitness and his family did not catch the first boom on tape, only heard it. After the first boom, the witness grabbed his phone to record the sirens outside.

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