This monument, which is a memorial to the victims of the terrorist attacks in Madrid in March 2004, is located alongside Atocha train station, where some of the attacks occurred. This monument to the victims of the Madrid terrorist bombings can be seen on the station's concourse.

With a glass cylindrical structure, a height of 11 metres and a diameter of 9.5 metres, its interior hides a large open-plan room on whose walls messages of condolence are written in several languages, left by anonymous citizens in the vicinity the terrorist attacks.  

After its refurbishment in 2019, the monument once more has exterior lighting in soft colours at night and in shades of blue on 11 March.