Giant's Causeway. This was a volcanic tube that cooled off and crystallized and now they are basalt columns.If you climb on top of them you can get a better view.
Yes I walked up this. I noticed neither children or middle aged people on the very steep trail (well, perhaps with one exception). There was possible a sheep or a goat or two.The view from the top was worth it.
Wimps - go ahead and take the tour bus back. :-)