Anything non-islamic can be that, it means 'house of war', land of unbelievers.
I'm quite aware, thank you very much. I must correct you however, land of unbelievers is "dar al-kufr", meaning (literally) "house of the non-believers.

However, several Islamic scholars (especially from Persia) have said that a non-Shari'a state can very well be a dar al-salaam.