Built a magazine and a signal tower 80 feet high.
A majestic light house stands like a signal tower guiding the seamen during night.
The hillfort, which is situated among rocky outcrops, is ideally placed for defence and likely served as a watchtower and possibly as a signal tower.
By 1433, the tower was also serving as a watch and signal tower in addition to a prison.
Just south of the island platform's end is a pyramid-roofed original signal tower.
A signal tower and dispatchers' office is at the extreme eastern end of the northbound platform.
According to tradition, the bell tower is a converted signal tower, while the sacristy is a former guard-house.
It comprises a main building, a stable block and a signal tower.
