The district of Horta-Guinardó is located in the northeast of the city, between the districts of Gràcia and Nou Barris and limited to the south by L'Eixample, Sant Andreu and Sant Martí, and to the north by the Collserola mountains. For centuries, it was farmland known as the valley of Horta. The village of Horta existed already in the 10th century. One of the reasons for the prosperity of the area was the fact that there was plenty of water available, to the point that, at the beggining of the 20th century, Horta had become the laundry of Barcelona. One can see features of the old village round Plaza Ibiza. There is also an area of detached houses. The Labrynth of Horta is the oldest preserved garden in Barcelona, it was created in 1794 inside the estate of the marquis Alfarràs, it is a vegetable labrynth with ornaments and water games.
The Guinardó was not developed until the beginning of the 20th century. It shares with the Eixample the Modernist masterpiece by Lluís Domènech i Montaner, the Hospital de Sant Pau, built in 1902.
The area of the Vall d'Hebron was transformed by the 1992 Olympic Games. Land not urbanized was transformed into sport facilities. Also apartments were built to house athletes and delegates and later allocated to residencial purposes. The sculpture Els Mistos by Claes Oldenburg and the ironic visual games by the catalan artist Joan Brossa were placed in the area during the Olympic Games too.