<human>:  When was Barcelona’s Eixample district built?
<bot>: The Eixample was built in the 19th century. It was designed by Ildefons Cerdà and built by Antoni Gaudí. The Eixample is an area in Barcelona that is named after the construction method used to build it. The Eixample is composed of several smaller neighborhoods that were built at the same time, and the buildings are connected by wide avenues.