2013 Boston Marathon finish line 2013 Boston Marathon finish line

Marking one month since the Boston Marathon bombings, CNN will air a documentary special with Anderson Cooper and Randi Kaye on Friday looking back at the iconic photographs of the immediate aftermath, the heroics of first responders and the stories of those injured on that grisly day.

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Back to Boston — Moments of Impact, airing Friday at 10/9c on CNN, will also feature interviews with photographers on the scene as well as the people whose stories they immortalized. Check out a sneak peek at the special, which will also encore on Saturday at 8/7c and 11/10c: