Last year saw a record number of visitors to the National Park Service’s more than 400 parks, monuments, battlefields, seashores and other sites. Those numbers are expected to increase as the agency approaches its centennial on Aug. 25, 2016.

The wealth of visitors is great but spreading it around can be a challenge, said Kathy Kupper, a spokeswoman for the park service in Washington.

“The iconic parks are always jammed, but there is incredible wildlife in Theodore Roosevelt, too,” she said, referring to the national park in North Dakota. “It’s just not on people’s radar.”

The same is true for the agency’s historic and cultural sites, she said.

“There’s a lot of focus right now on finding gaps in our collective history and culture. Not to take anything away from the classics, but the parks are more than wilderness.”