Mt. Rushmore in the Black Hills of South Dakota has a mysterious, menacing mark that some can't see.

That mark is probably a black ash and/or snowflake.

It falls from the top of Rushmore every winter, according to the National Park Service.

The mark has only appeared a handful of times since 1895, but it's currently bigger than ever before — at about 40 inches tall.

While it's huge, it's not impressive (at least to American icons) like Iwo Jima, Ed Sheeran, Frosty, or Columbus.

The original "Dead Horse Ride" was intended to guide snow riders to the summit of the great monument, and now the "Dead Man Ride" isn't there. The ride, carved into the rockface, dates back to 1887.

However, since winter now comes and goes in South Dakota with a regularity not seen since the snowmobile-era, "it's impossible to know for sure" whether there will be a marker installed to mark the missing ride.

The map above shows the history of the ride.

Is it going to have a new name?

Will this soon become the Mount Rushmore of all first-winter marks?

Does it remind you of Bryce Canyon or Grand Canyon or Yosemite?

Just how scary is the "Dead Man Ride"?

What are some of the other white spots in South Dakota that attract attention?

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is the fastest running car in the world... and America's most famous crime families. Oh, and then there's the most recognizable giant man statue in the world.

Join us as we investigate and unravel the mystery of the "Scary Mountain."

We're live today at 4 p.m. ET and you're invited to join our discussion and ask any questions in the comments section below.

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