There are some strange posts here. If you play without rules, the strongest castles will be those with the strongest heroes, and the strongest heroes are those who start with diplomacy – in a castle, a rampart, and a tower. If you play according to the rules, for example, in the World of Xeen style, then the top three are more or less obvious: 1. Necropolis. The main problem is having about 1000 skeletons by the third week. 2. Conflux: a) 4-5 phoenixes by the second week b) a powerful second-level creature c) many external dwellings d) several good heroes, led by the overpowered Luna 3. Dungeon. Here, the strength lies in a super-powerful start with Sha'kti. After that, it's just my opinion, so I won't write about it here. Inferno is certainly a difficult city, but you can break small (non-maximum) utopias on the second week with Inferno, without additional bonuses, angels from conservatories, etc. I myself, for example, only broke utopias on the second week with Necropolis without any bonuses.