Richard Rogers Architects has unveiled plans to convert a historic bull ring in Barcelona into a £63m leisure centre. A huge semi-transparent dome will cover the Las Arenas bull ring, which opened in 1900. The complex is to include a central garden complete with palm trees. It will remain an open space linked to Joan Miró Park and the city's Montjuic area, where several museums, exhibition halls and the Olympic stadium are located. The scheme is to include a running track.