This Monday, January 18th, is Martin Luther King, Jr. Day. It is a federal holiday and some people have the day off. If you are looking for something to do, some national parks have waived their entrance fee for that day.
The National Park System here in the United States encompasses 422 national park sites. These parks span across more than 84 million acres in each state and extend into U.S. territories, including parks in Puerto Rico, the Virgin Islands, American Samoa, and Guam. There is only one of those National Parks that fully closes in the winter. Do you know which park that is?