a city ... heap - Babylon, type of the seat of Antichrist, to be destroyed in the last days (compare Jer 51:37, with Rev 18:1-24, followed, as here, by the song of the saints’ thanksgiving in Rev 19:1-21). “Heaps” is a graphic picture of Babylon and Nineveh as they now are.
palace - Babylon regarded, on account of its splendor, as a vast palace. But Maurer translates, “a citadel.”
of strangers - foreigners, whose capital pre-eminently Babylon was, the metropolis of the pagan world. “Aliens from the commonwealth of Israel, strangers from the covenants of promise” (Isa 29:5; Eph 2:12; see in contrast, Joe 3:17).