Hyrule Castle has often been the site of some of the most dramatic scenes in Zelda and is often the battleground of Link and Ganondorf.
In the Ocarina of Time Ganondorf tricked the king in many ways to gain control of the land of Hyrule, it was also his final resting place in the game.
In Twilight Princess it was given the role of being the guarded area with a twilit shield surrounding it nobody could enter the castle, it was also not just the place you battle Ganondorf but also the battle ground of Link and Zant.
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