 Its walls enclosed a considerable area, reaching down from the upper part of the Rock of Gibraltar to the sea.The most conspicuous remaining parts of the Castle are the upper tower, or Tower of Homage, together with various terraces and battlements below it, and the massive Gate House, with its cupola roof.The Tower of Homage is the highest tower of the period of Islamic rule in the Iberian Peninsula, and the Qasbah of the Castle is the largest in the area.