We spent the day on a trip out to Inishmore, one of the Aran Islands, to see Dún Aonghasa.
This is a fort from about 200 B.C. that was built on the edge of a cliff. Parts of the cliff have collapsed into the ocean so the seaward side is now just a drop.
There obviously little in the way of safety precautions. There were a bunch of young boys playing soccer inside the fort and their ball sailed off the cliff.