While other places in the US are increasingly censoring how they tell their multicultural histories to travellers, one community is highlighting them.

On a warm late-summer afternoon, just across the Potomac River from Washington DC's marble monuments, I stood with an exuberant crowd of residents, civic leaders and history enthusiasts in Arlington, Virginia. A roar of applause rang out as two small bronze markers were unveiled in the pavement in front of a modest home, their surfaces etched with names and dates.

The small plaques may look unassuming, but these "stumbling stones" carry immense weight: they honour Killemacse and Con, two African Americans enslaved in the mid-1700s on farmland now belonging to one of the most well-known suburbs of the nation's capital, a place home to Arlington National Cemetery, The Pentagon and the Iwo Jima Memorial.

"[Back then,] this land was virgin forest," said Jessica Kaplan, one of the Arlington Historical Society (AHS) board member leading the effort. "As enslaved individuals, they had to clear the land with their own hands. They ploughed the soil and planted crops. They built their own quarters and silos to keep the corn."

Her words capture the heart of a growing movement to reveal the largely unknown history of the area's dark past. Known as Memorializing the Enslaved in Arlington, the initiative is a collaboration between the Arlington Historical Society and the Black Heritage Museum of Arlington and aims to commemorate the names and lives of those long erased from the area's historical narrative. The timing of the project is also telling: while other places around the US are increasingly censoring how they tell their multicultural histories to travellers, Arlington is highlighting them.

The stones are easy to miss if you're not looking for them, but their quiet power lies in their smallness. You don't need to go to a museum or read a textbook to learn about the past – you simply "stumble" upon them randomly on your walks around town. An ever-expanding map now threads through Arlington's neighbourhoods, each one part of a countywide effort to locate, document and honour the thousands of people once enslaved here. In the process, the initiative is turning public spaces into a site of remembrance.

The idea for the project began about four years ago, when Arlington resident Tim Aiken read a Washington Post article about Germany's Stolpersteine – small plaques placed in the pavement in front of the final homes of Holocaust victims. "[The author] suggested the US should do something similar for enslaved and Native Americans," Aiken recalled. "The idea stuck with me."

Aiken brought the concept to the AHS, whose board members........

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