It is a charming and welcome green space in the heart of Barcelona. It has water displays including a beautiful fountain and small lake along with lots of grass verges to lie down and soak up the warm sunshine. A great spot for relaxation, a walk... the place that I like the most is a glass building full of plants inside.
Where the lights come from is the national museum of art in Catalunya. Its an impressive building with great exhibitions and a huge collection of hostoric art. In that area you will also find Mies Van Der Roes house and Caixa forum (Av. Francesc Ferrer i Guàrdia, 6-8).