Rúin ón Spéir

9.30PM, TG4 ★★★★

First of a visually striking twopart aerial documentary exploring the secrets and hidden histories written into the very landscape of Ireland (right). We begin on the east coast, discovering the long and chequered history of a Viking prison island. The extraordinary secrets surrounding an ancient necropolis are also revealed by a hovering drone, and there is a look at how a Wicklow waterfall nearly severed the British royal line, the secret grave of Father Christmas and the strange tale of Europe’s only open-sea cable car.