Bilbao is the capital of Vizcaya, 100 km from San Sebastian and the largest city in the Basque Country. The metropolitan area is almost 1 million (5th larget is Spain) and is a major industrial hub.
It is home to the famous Frank Gehry-designed Guggenheim Museum, which was built in 1997 and is now a leading centre for art and architecture. There are also lots of other interesting museums scattered throughout the city.
The city has a cool vibe to it: the Old Quarter is full of funky shops, traditional cafes and restaurants.