Mayor Mamdani has turned New York’s LinkNYC kiosks into a citywide 9/11 memorial. The Mayor’s Office launched a digital tribute called Memory Markers that pins the stories of the New Yorkers who aided the rescue and recovery after the September 11, 2001 attacks to the streets where they actually did the work, sharing dozens of geolocated narratives across the city.

The idea, laid out in City Hall’s announcement, is to make the sidewalks themselves into a walking tribute. The markers run from a warehouse in Midtown to a lobby on Worth Street to a ferry crossing the harbor, each one attached to a first responder or survivor who was there.

The kiosks are one piece of a much larger 25th-anniversary push, which the city is marking on Friday, September 11. And the heavier news came the day before the tribute went live.