Nowadays you can get almost anywhere you want by plane. But there are places on Earth over which planes can't fly. They are restricted zones you can’t enter for security or secrecy reasons. Let's explore some of them and find out, why it's forbidden to fly over these places...

One of such zones is Disneyland and Disney World. It's forbidden to fly over the theme park without a special waiver and the restriction goes 3,000 feet above sea level. Another place protected from helicopters is a huge hole in Earth's surface. The giant pit is a diamond mine and it messes with the flow of air, creating a vortex that helicopters might get in... How's it possible?

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