Dark Hyrule Castle
"So, you've come to stop my little ceremony. Well, you're too late. A mere three more chimes of the bell will bring the ceremony to its end! And with the third toll of the bell, I will become like a god! And your precious Princess Zelda will be nothing more than cold, dead, stone."
Dark Hyrule Castle is the sixth and final dungeon in The Minish Cap. It is the dungeon where Link faces off with Vaati in a desperate attempt to save Princess Zelda from her stone prison and protect the Light Force from falling into the hands of evil itself.
As a whole, the dungeon is nothing more than a former Hyrule Castle perverted by the overflow of Vaati's evil magic, and instead of the castle guards that formerly populated the perimeter and the interior, Vaati's strongest henchmen -- the Black Knight among them -- take up arms to lay Link to rest.