We dislike the crowds in the big cities more and more, yet, if we want to see beautiful things we will have to go there. Our solution is to spend the night in small towns during the holidays and take a day trip to a city.
On one of those holidays, we wanted to see the modern art in Bilbao and we saw and experienced 3 amazing places. All 3 within walking distance of each other, unless you are not able to walk well.
There is definitely more to see in the city, but we went for modern art; architecture, paintings, and 3D work.