Fortresses appear all over the world and from ancient times through the dawn of modern-rifled artillery. While they serve some of the same functions as castles, the latter also serve as residences, where as true fortresses were only used for military defense. While fortresses appear all over the world, they tend to be concentrated in areas near rivers and mountain passes where they are most effective in reinforcing natural defensive positions. From northern India and Southern Spain, to Croatia and the Rhineland of Western Germany, these landmarks are amazing to behold from a bird's eye perspective, and you can see them all in this collection of fortress drone videos. Aerial photo: "Alhambra" by AirVūz content creator and drone pilot The Three Travelers.
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