Durdle Door is a natural limestone arch located on the Jurassic Coast near Lulworth in Dorset, England. It's a unique rock formation that looks like a doorway carved out by the sea over time. You can walk down a set of steps to get to the beach area, or walk along the top for great view over the sea. It gets busy during the weekends in Summer months, so try to visit during the day or earlier in the morning!