Urquhart Castle sits on the edge of the notorious Loch Ness home of the Loch Ness Monster, or Nessie for short. There isn't much left of the castle but it is picturesque and serene. As far as other castle and ruins go, this one pales in comparison. But we were in the area, and it was on our Heritage Pass so we stopped. It was off season so it wasn't busy and the lake was fog covered and beautiful. Had it been summer we would have definitely avoided this place. As a rule, we generally opt to skip the most touristy attractions such as Blarney Castle in Ireland which we've still not seen. Where you visit is obviously a personal preference. Stonehenge also is very well known and visited by tourists but I've been twice (in the off season, mind you) and enjoyed it quite a bit, I thought it was worth the price/crowds. I usually weigh costs and convenience of getting somewhere when deciding where or where not to go.