Eixample is a district of the Spanish city of Barcelona, that lies between the old city and the surrounding small towns. The district was built as an extension (hence the name “Eixample”) when Barcelona started to grow during the middle of the 19th century. The 7.5 square km district is characterized by long straight streets, a strict grid pattern crossed by wide avenues, and octagonal city blocks - rectangular blocks with the corners cut off, which are distinctive for Barcelona. This was the visionary, pioneering design by Spanish urban planner Ildefons Cerdà, who considered traffic and transport along with sunlight and ventilation in coming up with his characteristic octagonal blocks.