Inviting comparisons to Bilbao's Guggenheim, Cardiff's main arts complex (known locally as "The Armadillo" for its coppery, shingled exterior) is an extraordinary building, inside and out. The materials used in the construction are intended to represent "Welshness." (Slate is for the rocky coastline, for example, while wood is for its ancient forests.) The massive words carved into the curving facade read "In These Stones Horizons Sing" in English and Welsh. Inside there's a maritime feel, from the curving wooden stairs to balconies evoking the bow of a ship. A broad range of cultural programs take place on the various stages, from ballet and opera to major touring shows. Guided tours (£6) depart at 11 and 2:30 daily.