Inis Mor (Inishmore)

Dún Aengus Hillfort is the main draw to Inis Mór, the largest and most populated of Aran's three islands. Stretching more than 16 km (10 miles) long and about 2 km (1 mile) wide at most points, with an area of 7,640 acres, it's too large to fully explore on foot on a day trip, so hire a bicycle near the pier to navigate its lanes.

If time permits, head for the less frequented west of the island, visiting Dún Dúchathair, a dramatically sited, freely accessible promontory fort.