Atocha station memorial

The 11 m (36 ft) tall cylinder stands above Atocha station, the destination of the four trains that were attacked.

Texts composed of hundreds of expressions of grief sent in the days after the attack from all over the world are printed on a clear colourless membrane that is inflated by air pressure, rising balloon-like inside a cylinder.

That structure is composed of glass blocks and sits on a platform or terrace overhead.

King Juan Carlos, Queen Sofia and Prime Minister José Luis Rodríguez Zapatero attended a ceremony at the site on the third anniversary of the bombings, 11 March 2007.

Wreaths were laid at the foot of the tower and mourners observed three minutes of silence.