The answer, as the Internet likes to say, may surprise you. Those that sit on the D.C./Maryland line were deemed the property of the D.C. Department of Transportation. “But on the Virginia side, if you own the land, you own the stone,” Powers says.

Efforts to convince this mishmash of stakeholders to agree to a single rehabilitation plan were a bust, so D.C. is tackling just its stones, says DDOT transportation planner Gabriela Vega. Work started this spring with the help of the city’s Historic Preservation Office and experts from the National Park Service’s Historic Preservation Training Center.

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“There are very few people who know how to deal with stone,” says Vega, who cringes at “fixes” made by well-meaning members of the public.

The process proved more challenging than expected: The first day the preservationists were on the job, thieves stole their equipment. And some residents have trouble accepting that part of their yard belongs to the government.

The city has help from the Daughters of the American Revolution, who have considered themselves custodians of the stones since installing protective cages around them in 1915. DAR dug up their original blueprints, and hired a welder to accurately replace any broken bits.

The project is expected to be completed by the end of the year.

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Every boundary stone has a story. Here are our favorites:

SE6

901 Southern Ave. SE

This was considered one of the most attractive examples of a boundary stone until a car drove over it in 2008, Stephen Powers says. The cage was destroyed and the stone was knocked off its base. For years, it sat in an office. But this summer, SE6 came back — with a newly restored cage, too.

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SE9

0.225 miles southwest of the Oxon Cove Bridge in Southeast

It’s tough to visit this stone. Gabriela Vega says the preservation team must wait until after the nearby poison ivy dies to reach the out-of-the-way location. On boundarystones.org, the hiking directions include this line: “If you are on a small sandy beach with car tires and debris, you are in the right place.”

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NE8

Near the intersection of Eastern and Kenilworth avenues NE

Powers fondly recalls hiking through the woods down a litter-covered trail to visit this stone. It stood beside a shack, where a hermit lived. “He was a bicycle repairman, with a 20-foot pile of bike parts,” Powers says. Ever since a fire destroyed the building a few years ago, the stone has remained alone.