After the bombing of the Boston Marathon on April 15 last year, a makeshift memorial was created in Copley Square that paid tribute to the three people killed and 264 injured that day.

Pressure cooker bombs set off that afternoon into the crowd; a several-day manhunt ensued, as policemen attempted to arrest Chechen brothers Dzhokhar and Tamerlan Tsarnaev. During a night chase with police, Tamerlan was killed as well as an M.I.T. police officer, who was shot several times, allegedly by the bombers.

In the aftermath, people stopped by to drop off small tokens of their sorrow and respect for the victims — flags, shoes, T-shirts, teddy bears. The three victims who died were Krystle Marie Campbell, a 29-year-old restaurant manager, Lu Lingzi, a 23-year-old Chinese woman who was a graduate student at Boston University, and Martin William Richard, an 8-year-old who had been watching the marathon.

Boston Marathon memorials Mementos left at the Boston Marathon memorial in Copley Square last year included T-shirts and shoes worn at the race. REUTERS/Brian Snyder Boston Marathon memorials The crosses are for each of the three victims who died at the Boston Marathon bombings. REUTERS/Brian Snyder Boston Marathon memorials Boston laborers left a hat saying, "God bless!" REUTERS/Brian Snyder Boston Marathon memorials "We will finish the race." REUTERS/Brian Snyder

City Archives gathered all the items and archived them. The mementos will be placed inside the library at Copley Square, part of an April 7-May 11 exhibit.