For a look at a well-preserved caher (walled fort) of the late Iron Age–Early Christian period, stop at Caherconnell Fort, a privately run heritage attraction that's more serious than sideshow. Exhibits detail how the evolution of these defensive settlements may have reflected territorialism and competition for land among a growing, settling population.
Gleninsheen Wedge Tomb
One of Ireland's most famous prehistoric grave sites, Gleninsheen lies beside the R480 just south of Aillwee Caves near Ballyvaughan. It's thought to date from 4000 to 5000 years ago. A magnificent gold torc (a crescent of beaten gold that hung round the neck) found here and dating from around 700 BC is now on display at the National Museum in Dublin.