Brecon Beacons National Park.

Spanning 520 square miles of South and Mid Wales, this protected landscape—officially known by its Welsh name, Bannau Brycheiniog—is defined by its old red sandstone peaks and flat-topped ridges. The park is anchored by Pen y Fan, the highest summit in southern Britain, but the terrain is varied, moving from the dramatic scarp of the Black Mountains to the subterranean cave systems and "Waterfall Country" in the south. As an International Dark Sky Reserve, it offers some of the clearest stargazing in Europe, while the Fforest Fawr region holds UNESCO Global Geopark status for its unique glacial geology. Beyond the hiking trails and wild Welsh mountain ponies, the park is dotted with Neolithic standing stones, Roman forts, and quiet market towns that maintain a traditional, pastoral pace of life.