Lincoln, Neb.-- Hundreds of graves marked by a stone slab.
Some have numbers identifying the dead.
Others, that number has faded away, or the slab sunk into the ground.
The Nebraska Department of Health and Human Resources, in tandem with Nebraska's regional centers, held a moment of silence Wednesday to honor the thousands of people that have lived and died at the centers.
In the 19th and early 20th centuries, most people who died at these centers were buried anonymously and their graves marked only by a number, according to information from Nebraska's regional centers.
According to Carol Coussons de Reyes, administrator for the DHHS, these burials happened at a time when doctors and society unfairly segregated the mentally ill.
Wednesday, Reyes and several others met at Lincoln's regional center to shine a light onto a dark part of history.
"It's really important to have a connection to the past," Reyes said, "so that we don't forget how people were forgotten in the past and died unrecognized...It's important to provide that recognition."
Regional centers in Norfolk and Hastings also held ceremonies Wednesday.
Lincoln's center has 717 such graves, Norfolk 842 and Hastings has 1,415.