I have not done a lot of trips with portages, and don't remember seeing any weird sites on portages. The only odd thing I saw was a footbridge and that was only odd because it was my second time across, and I knew there was no footbridge on the portage trail. With my canoe on my shoulders I was walking head down watching the path, and I took a wrong fork in the trail without knowing it. AKA, lost. Was that a rookie mistake or is finding yourself on the wrong trail commonplace?