Single (music) - Types. 1  Singles have been issued in various formats, including 7-inch (18 cm), 10-inch (25 cm), and 12-inch (30 cm) vinyl discs (usually playing at 45 rpm); 10-inch (25-cm) shellac discs (playing at 78 rpm); cassette, 8 and 12 cm (3- and 5-inch) CD singles and 7-inch (18 cm) plastic flexi discs.
Conwy Castle. Conwy Castle, a World Heritage Site, is a magnificent fortress in North Wales. Built by James Saint George for King Edward I, it has towered over the medieval town of Conwy ever since.onwy Castle. Conwy Castle, a World Heritage Site, is a magnificent fortress in North Wales. Built by James Saint George for King Edward I, it has towered over the medieval town of Conwy ever since.
previous next. The Smithsonian Institution Building, popularly known as the Castle, was designed by architect James Renwick, Jr. The building is constructed of red sandstone from Seneca Creek, Maryland, in the Norman style (a 12th-century combination of late Romanesque and early Gothic motifs).