For decades, Ireland's mother and baby homes were shrouded in secrecy. Some say the veil still hasn't lifted

A memorial at the former site of the Tuam Home, where hundreds of babies who died there were put into what is now thought to be a series of chambers located inside a decommissioned sewage tank.

Tuam, Ireland (CNN)The day after Michael O'Flaherty was born, his mother tried to see him. But, she told him, she was stopped by a nun who told her, "Go mind your own business, your baby is gone."

Like other women who gave birth at the Tuam mother and baby home in Ireland, the nuns didn't forbid O'Flaherty's mother from seeing her newborn son again, they just didn't tell her who her baby was, or that he was in the same building. The very same home where she was required to stay for 12 months after giving birth.
"My mother could have picked me up, but she couldn't have necessarily known," O'Flaherty told CNN.
    The boy would stay in the home for another five and a half years. He doesn't remember his time inside; his first memory of it was from the day that he left.
    Today, at 71, O'Flaherty retraces the steps he took that day with a group that's become like family.
    They walk in front of an unassuming patch of grass, a square bit of land flanked by a children's playground on a housing estate. Behind them, a Virgin Mary statue hangs on the site's gray walls, a perimeter of aging stone punctuated by green vines that climb over the parapet. In the corner, a tiny pair of children's shoes are attached to the wall in memoriam.
    Below their feet lie the bodies of hundreds of babies.
    Any of the group walking there today could have been among them. But they were the fortunate ones.
    They are the survivors.
    Bound together by being born into one of Ireland's most notorious mother and baby homes -- church-run institutions where unmarried women were sent to deliver their children under a veil of secrecy, silence and shame for decades -- the Tuam Mother and Baby Home Alliance believe that their stories are at risk of being wiped from history.
    In February, a commission set up to investigate what ha