Happy 143rd birthday, Yellowstone National Park! On this day in 1872, Yellowstone became the first national park — starting a worldwide movement to protect special places. Today, millions visit Yellowstone to discover the park’s geysers and mud pots, forests and lakes, and historic cabins and prehistoric sites — not to mention it’s stunning waterfalls. Pictured here is a rainbow at Lower Falls on the park’s Uncle Tom trail. Photo by Kallem Phillips (www.sharetheexperience.org).

I caught this action shot of @dbergz9 during our hike up Rainbow Falls Trail in the Great Smoky Mountains National Park.