The city of Bilbao was founded by Diego Lopez de Haro on June 15th 1300 on the right bank of the river Nervión. Throughout that century, Bilbao grew due to trade, pilgrims walking the Camino de Santiago and trade with the largest ports first in Europe and then America, as it became the most important city of Bizcaia.
In the 15th century, four streets were added to the original three in the centre, giving it the name las Siete Calles (the Seven Streets), also known as Casco Viejo de Bilbao (Old Town of Bilbao). The Cathedral of Santiago was constructed and became the emblem of the city.
In the 19th century, the arrival of the railroad gave a new economic and urban impetus to Bilbao. Streets, avenues and pavements were built as well as the Plaza Nueva and the Arrriaga Theater .
The late 20th century brought new urban transformation led by the Guggenheim Museum, which turned the city into an increasingly attractive destination for tourist.