Durdle Door

Durdle Door (sometimes written Durdle Dor) is a natural limestone arch durdledooron the Jurassic Coast near Lulworth in Dorset, England. It is privately owned by the Welds, a family who
owns 12,000 acres (50 km2) in Dorset in the name of the Lulworth Estate. It is open to the public. The name Durdle is derived from the Old English ‘thirl’ meaning bore or drill.

Source: Wikipedia