Besides the two Koules of Askyfou, several other Koules had been constructed in the present province of Sfakia in order to suppress the revolutions of the Sfakians.
Above Loutro there are still the ruins of the Turkish fortress, Koules, which dominated over the current settlement. The building was built in 1868 and had two towers on west and east sides. It has rectangular shape and some of its walls survive. Outside the walls, there are big tanks surviving.