Diane and George Gravlee weren't seeking glory or recognition when they set out to build homes for the needy.
But more than two decades later, the duo reached the impressive mark of constructing a home in all 50 U.S. states – a feat they accomplished this week in North Dakota.
The couple, both in their 70s, embarked on their journey as Habitat for Humanity volunteers in 1994, and have traveled the country in their RV helping build houses ever since, according to the organization.
“When we got to like state 38 we said, gee, maybe we should try for 50," Diane Gravlee told WDAZ, which says they're now in Grand Forks working on a home for a family from Somalia.
And though the Gravlees have hit every state in the union, they don't plan on stopping their humanitarian travels, the station adds.
To mark the accomplishment, the Red River Valley Habitat for Humanity – which the couple is partnering with to build the home – honored them with a recognition plaque on Friday, the Forum reports.
The paper adds the Gravlees have worked on more than 138 different builds in their time as volunteers.
Habitat for Humanity is a nonprofit, international Christian organization that relies on volunteers to construct, renovate and repair homes, its website says. It's part of a mission to provide affordable housing around the world.
The group's most high-profile member may be former President Jimmy Carter, who with his wife, Rosalynn, has been building homes for families in need for over 30 years.