WASHINGTON (AP) — After nearly 100 years, the National Park Service holds some of the most beautiful and historic places in the country. But there’s also an $11 billion backlog of unfunded maintenance and a visitor base that’s aging and mostly white.

Now the park service is preparing for its centennial in 2016 by launching a major campaign Thursday to raise support and introduce a new, more diverse generation of millennials and children to the national parks.

Michelle Obama and Laura Bush will co-chair the campaign, calling on Americans to “Find Your Park” to enjoy their public lands. Behind the scenes, officials are also working to expand their fundraising and congressional support to improve the nation’s parks.

The push to “Find Your Park” is the third major campaign in the national parks’ history.