There is a tradition for hikers to mark paths with pile of stones...while i was roller-blading last night (Yes i have said night). Next to the northern coast of Reykjavík, next to Sæbraut (the sea avenue), there is a walking/biking/roller-blading path. There was a man piling stones. That is pretty amazing. The guy doing it (second picture) have a great sense of balance.....Look at the different stones. I am still wondering how he is doing it.