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Generally speaking, it's a Barbarian castle. For me, it's my absolute favorite castle in all the "Heroes" games, starting with the first one.
In second place is the Dungeon. It's so unusual... the buildings, you could say, hang over the abyss... and it's not scary?!? )))))
In third place is the Fortress, again, for the originality of the city - it's like a crater, the walls of which are arranged as dwellings, etc.