Casco Viejo and the Medieval Siete Calles

Casco Viejo, the old quarter of Bilbao in Biscay, Spain, preserves the footprint of the medieval town chartered on 15 June 1300 by Diego Lopez de Haro V, Lord of Biscay. The original settlement was organised around seven parallel streets, the Siete Calles, which run from the Cathedral of Santiago toward the Nervion river: Somera, Artekale, Tendería, Belosticalle, Carnicería Vieja, Barrenkale and Barrenkale Barrena. These streets were the commercial and craft heart of a port town that exported Castilian wool and Biscayan iron across the Bay of Biscay for centuries, and many still carry names that recall guild trades. The historical significance of the district lies in this survival of a planned medieval grid inside a city that later rebuilt much of itself in the industrial era. The Ensanche was laid out across the river in the 19th century, leaving the old quarter as a compact pedestrian district. What is preserved is chiefly the street pattern, narrow parcel widths, and a mixture of Gothic, Baroque and neoclassical buildings rather than a single monument. Landmarks along or beside the seven streets include the Cathedral of Santiago, the Plaza Nueva, the Iglesia de San Anton and the Mercado de la Ribera, each of which contributes a different period to the quarter. Architecturally the area is characterised by tall, narrow townhouses with wooden balconies, ground-floor shopfronts and shuttered upper windows, plus small plazas such as Plaza Miguel de Unamuno and Plaza Santiago. The district is explored on foot rather than through a curated exhibition, so the interpretive approach is open-air and thematic, with Bilbao Turismo providing guided walks that follow the medieval chronology from the founding charter to the guild era. Restoration has been continuous since the late 20th century. Floods, notably the severe Nervion flood of August 1983, damaged parts of the quarter, and later pedestrianisation, façade rehabilitation and the reuse of old buildings for shops and pintxo bars have returned it to active use. Today it is a living neighbourhood rather than a museum, and its state of preservation is good, with traffic largely excluded and building heights respected. Visitors can combine it with the nearby Basque Museum and the riverside promenade, and the streets are busiest in the evening when pintxo bars fill.