surprised to see the thumbnail picture you used is Blaise Castle folly in Bristol,UK. BTW it is not a castle at all but just a talking point folly in the grounds of a manor house now owned by the city.
Strangely exactly this picture is used on the Wikipedia page!
Drones are, in essence, flying autonomous vehicles. Pros and cons surrounding drones today might well foreshadow the debate over the development of self-driving cars. In the context of a strongly regulated aviation industry, "self-flying" drones pose a fresh challenge. How safe is it to fly drones in different environments? Should drones be required for visual line of sight – as are piloted airplanes? Join EE Times' Junko Yoshida as she moderates a panel of drone experts.