Carlsbad Caverns National Park is offering free admission from April 17-25 to celebrate National Park Week.
Fees will still be charged for guided tours.
The park in southeastern New Mexico also will offer special programs, such as rope climbing demonstrations.
The nearby community of Carlsbad, in partnership with the park and others, plans a March for Parks at Living Desert Zoo and Garden State Park on April 24.
March for Parks is a walk involving thousands of Americans nationwide. Every dollar raised at the event goes for projects at the local level.