The Grassy Knoll—the rock art depiction of American presidents Mount Rushmore —has turned to water.

Stacie Belmonte, an independent photographer who was in South Dakota with her camera crew, documented the unusual phenomenon. Belmonte was on Old Man’s Ridge Trail, a less traveled, 30-mile hike, when she saw the unusual development. According to the Washington Post, “She decided to take a selfie and post the shot to social media. Soon, she started getting other mentions, not just from locals.”

And it’s not the first time water has appeared on the mountain. According to the Post, a geologist at Fort McCoy found and cleaned up a small amount of the water 15 years ago. But, the Washington Post reports that “this is a slightly more extensive find, and probably caused by a microburst or unseasonable wind gust.” It’s unknown if it has anything to do with global warming. The news outlet reports that the waterfall has caused a tourist site to close.

Anyone who’s considered ascending Mt. Rushmore and getting a selfies will be disappointed to know that the waterfall in South Dakota isn’t even part of the actual marble monolith. The Post reports that the monolith “is composed of rock made up of giant chunks of granite weighing more than 21 tons each, sandwiched between 14 individual girders supporting the carved heads.”

The four presidential heads continue to be sculpted up the mountain.

If you’re in the mood for more water on one of the world’s most recognizable (and beautiful) mountains, you can catch one of the photos of the phenomenon for yourself on Instagram.

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