Nature doesn't take nonsense from us people. Sardinia Bay in Port Elizabeth has a problematic dune that just doesn't want to stand still. A couple of years back a walkway was built across the dune to make it easier to get to the beach. But as soon as the walkway was completed the dune started swallowing it in until this short section was the only bit left. Vandals, probably looking for wood to braai with, did the rest after people were unable to use it anymore.