The Wales Millennium Centre sits on Cardiff Bay's waterfront like a vast copper-roofed beetle, its facade inscribed with the words "In These Stones Horizons Sing." The line was written by the Welsh poet Gwyneth Lewis, who imagined music drifting out across the water. It's an apt image for a building that is, quite literally, made of Wales.

Every material was sourced locally. The steel roof is oxidised with copper, nodding to Swansea's 19th-century dominance of global copper processing. The walls use slate waste from five Welsh mines, the striped layers echoing the nearby cliffs. Even the seats inside are Welsh timber. Opened in 2004, the Centre is home to the Welsh National Opera and the BBC Orchestra of Wales, who record Doctor Who's title music here.

VoiceMap's Cardiff Bay tours use the Centre to trace Wales's industrial past through its architecture and to follow the Doctor Who filming locations that have made this waterfront world-famous.