The iconic rock arch of Durdle Door, just around the corner from Lulworth Cove. The limestone arch is the result of erosion of different hardnesses of rock by the sea. At some stage the arch will collapse leaving just a stack Posted by Dorset Guide on Sat, 03/21/2009 - 12:24 × Related images Durdle Door in the Spring Purbeck Cliffs Durdle Door - Man O'War Bay