Roald Dahl Plass, Cardiff

Roald Dahl Plass is a public space in Cardiff Bay. It is named after Cardiff-born author Roald Dahl, and is located on the coast along the south of the city centre. The square is home to the Senedd building housing the Senedd, the Welsh parliament, and the Wales Millennium Centre, a performing arts centre. The bowl-like shape of the space has made it a popular amphitheatre for hosting open-air concerts.

What was known as the Oval Basin was designed by artist William Pye, in conjunction with Nicholas Hare Architects and it opened in April 2000. A plaque was unveiled 13 July 2002 to commemorate the rename of the Oval Basin to Roald Dahl Plass. Roald Dahl Plass is today an oval shaped open space surrounded by illuminated pillars and a gravel covering over the original dock area.

At the north end of the plass is the Water Tower, which stands at approximately 70 feet (21 m) high with an intermittent stream of water running down the metallic fountain. The tower was also designed by Nicholas Hare Architects in conjunction with the sculptor, William Pye.

Roald Dahl Plass first appears in "Boom Town", an episode of the long running, sci-fi drama Doctor Who. In the show's universe, a "spatial-temporal" rift runs through Cardiff, a feature that the Tenth Doctor uses as a fueling station for his TARDIS. The plaza later appears in Doctor Who's spin-off series Torchwood. The fictional Torchwood Institute has one of its headquarters, Torchwood Three, based under the square, to monitor alien activity through the rift. The Water Tower has prominently featured in both of the BBC Wales flagship shows.

The base of the fountain can be seen passing through the building, and one of the paving tiles in the square is a decoy which hides an "invisible lift" leading down to the base. This base was effectively destroyed in Torchwood: Children of Earth but the Plass was seen for a brief moment at the end of the first episode of Miracle Day.