I took this shot off the coast of County Clare, Ireland when exploring the Aran Islands. We spent the day on Inisheer, the smallest of the islands. The gray limestone throughout the island landscape is truly grand as well as the island’s many stone walls.
This photo is of grikes (crevices) in the surface. They provide moist shelter for a wide range of plants. When the limestone pavement is covered by a thin layer of soil, patches of grass are seen, interspersed with plants like the gentian and orchids. (information from wikipedia)