All castles in Heroes 3.

What I like about the Tower (Dungeon) is the presence of an artifact shop. And conquering the tower (laying siege to it) is very easy. (knowing that there are mines, don't send a unit there, or cast a spell with an expert in water to remove the enchantments).

Added 2 minutes later
And I don't like the Elves (in appearance) because they live in a tree. They seem like some kind of savages, and it's annoying to see them laughing at unicorns when they attack...