Have you heard about the 12km walk in Santorini? No?
Well prior to asphalt roads being built, the two main cities (Thira and Oia) of Santorini were travelled to and from along the top of the coast. The path, as you may have guessed, is 12km long.
If you have the time, I suggest you walk it. The view is stunning and so is the environment. Because Santorini is affected by an active volcano, the erosion is quite fantastic with its mix of colours. As you walk along the path, you will see black rocks and then a whole area that is completely red.