A small glass tower channeling light into an underground chamber was unveiled as a memorial to victims of the Madrid train bombings, meters away from where the blasts killed 191 people exactly three years ago today.
King Juan Carlos and Queen Sofia inaugurated the memorial less than a month after 29 suspects went on trial in the attack that ripped apart four rush-hour trains approaching Madrid's Atocha railway station.
Around 1,800 people were injured by 10 bombs, which had been stuffed into sports bags and set off by mobile phones. One woman remains in a coma.
On a sunny spring day, relatives of victims and survivors bowed their heads in silence as the king laid a wreath at the foot of the 11-meter (36 ft) tower -- its height a reference to the date Spain suffered its worst peace-time attack.
The tower's architects - five friends working on their first commission - said the design's main ingredient was light.
Sunshine hitting the column of 15,000 glass bricks focuses light into an empty, blue chamber below a busy highway, which the public can access via Atocha station.
From below, visitors can peer skywards to read hundreds of messages of condolence and support wrapped around the inside of the cylinder.
The trial of those accused of carrying out the attacks will hear from more than 600 witnesses and 100 experts before a panel of three judges gives its verdict, probably in early autumn.
Separate commemorations were held at two other stations hit by blasts.