Site of the deadliest American mass shooting in the 21st century. Pictured are 1,100 casings, the number of rounds fired by the gunman, in 58 stacks, the number of victims killed. Hundreds more were injured.

Site of the 1993 siege of the Branch Davidian compound where four federal agents and six sect members died in a gun battle prior to the fire that killed 76 people.

Stadium where a high school boy shot and injured 10 students at a football game in 2019.

Columbine High School. April 20, 1999 two teen boys killed 13 people and wounded more than 20 others before killing themselves.

Movie theater where a man killed 12 people and injured 70 others. July 2012.

Boise, Idaho. Near the site where a 19-year-old woman was murdered. On average 3 women are shot and killed every day in the US by their partner. Women of color are disproportionately murdered in partner-related violence.

Pulse Nightclub where a man killed 49 people and wounded 53 others in the deadliest incident in the history of violence against LGBT people in the United States.

Site where Michael Brown, an 18-year-old African American man, was fatally shot by a white Ferguson police officer.

Spot where Tupac Shakur was murdered in 1996.

Site of the 1966 University of Texas tower shooting where a former U.S. Marine shot and killed 13 people (including a pregnant woman) and injured 31 others.

Site where shooting spree started in August 2019. A man killed 7 people and injured 25 others.

Emanuel African Methodist Episcopal Church. Site of 2015 mass shooting in which nine African Americans (including pastor and state senator Clementa C. Pinckney) were killed. President Barack Obama delivered the eulogy and sang Amazing Grace at Pinckney's memorial service.

At the Walmart where a male shooter killed 22 people and injured 24 others. August 2019.

Lorraine Motel (now the National Civil Rights Museum) where Martin Luther King, Jr. was assassinated. April 1968.

Site where a neo-Nazi gunman killed three people. April 2014.

Near the site where memorial services were held in December 2019 for Houston Police Sergeant Christopher Brewster who was shot and killed on a domestic violence call.

Marjory Stoneman Douglas High School where a male 19-year-old former student killed 17 people and injured 17 more.

Unauthorized photo taken inside a gun show.

Site where homeless couple was shot and killed while sleeping under an overpass. December 2019. Suspect is still at large.

Memorial in front of the house of a 13-year-old girl who was shot and killed by her 16-year-old boyfriend. December 2019.

Playground where a 14-year-old boy brought a stolen gun to school.

Site of a suicide by gunshot inside a car in 2017. Every year in the U.S. an estimated 22,000 people kill themselves with guns.

Marysville Pilchuck High School, an hour south of the US-Canada border. In 2014 a 15-year-old boy shot five students, killing four, and then killed himself. Since this shooting in 2014, there have been 255 school shootings

In 2018 in this school parking lot, a 19-year-old man was shot and killed by a 17-year-old boy. Police classified this incident as a suspect-on-suspect murder. In 2018, there were 2,100 such deaths in the US.

Near the site where a male aviation student from Saudi Arabia killed three people and injured eight others on December 6, 2019.

Unknown number of Native Americans killed in genocide by European settlers, many killed by gun fire.

Installation with 1200 bullet casings, representing the number of gun violence deaths in the U.S. every 10 days.

Inside the tequila bar where a man shot and killed four people in a bar fight.

Historic State Penitentiary. This cell held a prisoner who shot and killed a man in the 1960s. There are currently 179,000 inmates in state prisons across the US convicted of murder with a deadly weapon.