Stonehenge is a prehistoric monument in Wiltshire, England, about 2 miles west of Amesbury and 8 miles north of Salisbury. One of the most famous sites in the world, Stonehenge is the remains of a ring of standing stones set within earthworks.
The stone circle at Castlerigg (alt. Keswick Carles, Carles, Carsles or Castle-rig) is situated near Keswick in Cumbria, North West England. It was constructed as a part of a megalithic tradition that lasted from 3,300 to 900 BCE, during the Late Neolithic and Early Bronze Ages.
Conwy Castle, Wales, is one of the most prominent fortresses built by Edward I in the 13th century. It is one of the key castles of the king's "iron ring" of fortresses constructed in Wales. The stronghold was quite an expensive undertaking - it is estimated that Edward spent £15,000 (£162 million in 2009) on the construction, which makes it the most costly castle in the Welsh history. Today Conwy is declared a World Heritage Site.