The story
As you stand here at the mouth of the Urumea River, where the fresh water meets the salty surge of the Bay of Biscay, you are looking at one of the most daring architectural statements in all of Spain. These are the Kursaal Congress Centre and Auditorium, but to the locals here in San Sebastián, they are simply known as the Cubes. Take a moment to look at how they sit against the horizon.
They don’t quite look like buildings, do they? They look more like two giant, translucent rocks that have been washed up on the shore by a particularly heavy tide. This was exactly the intention of the architect, Rafael Moneo.
When he designed this complex in the 1990s, he wanted to create a dialogue between the urban landscape of the Gros neighborhood and the wild energy of the sea. Before these glass structures arrived, this very spot was occupied by the Great Kursaal, a magnificent, palatial casino and theater built in the 1920s. For decades, it was the height of Belle Époque elegance, but after it was demolished in 1972, the site sat empty for over twenty years.
There was a great local debate about what should replace it. Should it be something classical to match the rest of the city, or something entirely new? Moneo’s victory brought us these two tilted prisms.
If you look closely at the glass, you’ll notice it isn’t flat or clear. There are ten thousand translucent glass panels, curved and textured to diffuse the light. During the day, they reflect the metallic gray of the Atlantic sky, but at night, they transform into giant lanterns, glowing from within and illuminating the Zurriola beach behind you.
This building isn’t just a pretty face, though; it is the beating heart of the city’s cultural life. Every September, the world’s eyes turn to these steps for the San Sebastián International Film Festival. This is where the world’s greatest directors and movie stars walk the red carpet to receive the prestigious Golden Shell award.
If you walk around to the terrace facing the sea, you can feel the spray of the waves and hear the shouts of the surfers on Zurriola Beach. It is a place where high culture meets the raw, everyday life of the Basque coast. As you continue your walk, notice how the Cubes seem to change shape and color depending on your angle.
They are a reminder that in San Sebastián, tradition and modernity don’t just coexist—they dance together right at the water’s edge.