Then & Now: Boston Marathon bombings
The streets and sidewalks have been scrubbed, and building facades have been rebuilt or boarded up. Trees have started blossoming. It's all surreal when contrasting scenes now versus scenes from the immediate aftermath of the explosions.
Pictured: One of the first images of the explosion that was sent out on Twitter at about 2:50 p.m. on April 15, 2013 and an image taken 10 days later.