Pla de l'Eixample is a district in Barcelona, designed in the 19th century by architect Ildefons Cerdà. It is known for its grid layout, wide streets, and chamfered corners, which promote better air circulation and light. The area features a mix of residential, commercial, and public spaces, making it a vibrant part of the city. The district is home to several notable buildings, including works by famous architects like Antoni Gaudí and Lluís Domènech i Montaner. Pla de l'Eixample is also recognized for its modernist architecture, with many structures designated as UNESCO World Heritage Sites.