Three people died and more than 260 were hurt by the explosions.
Plus an MIT police officer was shot and killed as the bombing suspects tried to run.
One couple from Washington County was there when it all happened and they're going back again this year.
Roger Quimby was stopped about three quarters of a mile from the finish line after the bombs went off.
His wife was waiting for him on Boylston Street.
They couldn't find each other for around an hour, finally reaching each other through a text.
That time was filled with chaos and emotion.
They're headed back to Boston this weekend, so Roger can get ready for the 118th Boston Marathon.
Roger says he just wants to cross that finish line.
They are prepared for the extra police presence and strict bag regulations.
But they don't mind.
They're rather excited, knowing now it's even a stronger city from when they left it.
"I didn't have any idea how bad it was, but I knew she was down there - ambulances coming, flying up past you, the sirens. Just emotional, it was at the time, not knowing," says Roger.
"It's going to be Boston strong this year, everyone is going to be there, you can't do that in Boston," says Marsha.
More than 30,000 runners are gathering next week for the race.
26.2 miles of spectators cheering.
Roger says it's a unique experience and he can't wait to run again.
Roger says this may be his last marathon, running 13 throughout his life already and 58 half marathons.
He says runners are a specific breed of people who support each other, especially after such a tragic event.