5 Oldest National Parks in the United States

4. Mount Rainier National Park

Date Established as Park: March 2, 1899

Mount Rainier National Park in Washington state is one of the oldest national parks in the US. Mount Rainier, the highest point in the Cascade Range, is an active volcano and one of the most glaciated peaks in America. Mount Rainier National Park, best known for its geologic and glacial features, protects over 97% of its area as wilderness under the National Wilderness Preservation System.