I personally think they're insane. When I did the bike tour of Ireland I was on Inishmore in the Aran Islands overnight... we saw the Cliffs of Moher and stood atop them at Dun Aengus, the ancient fortress...
much like these pics, there is no guardrail...I'm not afraid of heights but I STILL got nervous. People were sitting on the edge with their legs hanging over... nope not me. I walked within about 50 ft of the edge and that was close enough...it's a LONG way down.
Here's some more of the cliffs... (I got this pic from the net... mine are on disc but not downloaded on the computer... I'd give credit to the photographer but not sure who took this... )



it's a LONG way down.
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