In honor of the Birthday of Martin Luther King, Jr., National Park Service sites will waive entrance fees for everyone on Monday, January 17, 2022, as the first fee free day of the year. Commemorated on the third Monday of January every year, it is also a day of service when hundreds of volunteers participate in service projects at parks across the country.

https://www.nps.gov/subjects/npscelebrates/mlk-day.htm