The Pembrokeshire Peninsula abounds in megaliths and dolmens, such as the cromlech of Pentre Ifan. Christianity has also left its mark as can be seen inside St David's Cathedral (12C-13C) and Pembroke Castle. In 1952 the coastline was designated a National Park; it is the smallest National Park but also that with the most coastal scenery. It boasts a wonderful variety of beaches, some delightful seaside towns, such as Tenby, and a cliffline that is often as spectacular as Stacks Rocks.