William Parsons put Offaly at the centre of global astronomy in 1845. He built the largest telescope in the world until the construction of the 100-inch (2.5 m) Hooker Telescope in California in 1917.
There is not much left of Dunseverick Castle, the last fort on this location for perhaps over three thousand years. Though the historical records are sketchy, this was also a power centre for the Dal Riata kingdom which used its maritime skills parts of the north off Ireland and the west of Scotland
Sketrick Castle is a castle on Sketrick Island near Whiterock, County Down, Northern Ireland. It is surrounded by a drumlin landscape some of which is submerged in Strangford Lough as small islands.