In the historic town of Carrickfergus on the East Antrim coast, there is a massive castle, old town houses, a historic pier—and a strange-looking tower at the end of the pier. This odd construction opposite Carrickfergus Castle is known as a Radar School Tower, and was primarily used to monitor shipping arrivals and departures from the Belfast Lough area. The tower was built in the 1960s, but with improved technology it soon became obsolete, and was completely derelict by the 1990s. Yet it still sits at the end of the…