Spiders, deep instinctive fear and not learned as no one else in my family is bothered.
I also have a fear of ships propellers but also the hulls, have terrifying images of being in the water next to a large ship. Went snorkelling once in Florida and freaked out upon returning to the dive boat as I could see the whole of the underside. Also don't like dams, something about all the water being held back is not right.
Don't like traversing hillsides and ruts.