BOSTON – The Boston Marathon Bombing memorial will be officially completed today as workers are scheduled to place the last three stones at the site located on Boylston Street at the finish line of the marathon, per CBS.

The three stones pay tribute to the victims who lost their lives in the horrific bombings six years ago on April 15, 2013: Krystle Marie Campbell (29), Lü Lingzi (23) and Martin William Richard (8).

Each stone placed at the Boston Marathon Bombing memorial was taken from a place special to the victim. Krystle Marie Campbell’s stone is from Spectacle Island, a place her parents thought she was at her happiest when visiting.

“Martin’s stone came from Franklin Park in Dorchester because that’s a place where he used to love to go. Lingzi’s stone was donated by B.U. because that’s where she went [to school],” the memorial's artist Pablo Eduardo shared back in March.

The memorial has taken four years to complete with a cost of $2 million. Artist Pablo Eduardo's tribute to the victims of the bombings and those injured in the attack is a creation made of bronze, glass and granite.

The bronze represents strength while the glass represents fragility. The Boston Marathon Bombing memorial also features bronze plated bricks in memory of police officers Sean Collier and Dennis Simmonds. Both officers died during the manhunt for convicted terrorists Dzhokhar Tsarnaev and Tamerlan Tsarnaev.

It is Pablo Eduardo's hope that his artistic creation will memorialize the victims of the attacks and represent the Boston's strength following what was one of the most devastating terrorist attacks in U.S history.

"I think Boston dealt with this in a Boston way," Eduardo shared per WBUR. "They had Boston Strong. It's such a strong community of ideals that they knew how to be nonreactive ... I hope it reflects here."

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