Most national park boundaries are fairly static, not growing or shrinking over the years. But Wind Cave National Park is growing by more than 5,500 acres thanks to an acquisition arranged by The Conservation Fund, and now park officials are working on a plan to manage that addition.

Here's some President's Day trivia: How many presidents are memorialized in the National Park System? The answer? At last count there were at least 32 places throughout the park system where a past president is honored.