It's not natural, but it's notable

 

Above the Mississippi River city of Winona, Minnesota, there's a landmark. Now, the landmark has been shaped by human activities, so as the title says, it's not natural.  But it's hard to miss. So it's on the National Register of Historic Places.

I'll provide context and illustration.  Context; the Wikipedia entry:  Sugar Loaf (Winona, Minnesota)

Illustrations:

Sadly, though I've been in the area, I don't remember seeing this.  But when I discovered it, I thought about the fact that there are many "Sugar Loaf" mountains, hills, domes, etc., around the world.  So I thought it would be a good idea to research why.  

Here's why, with context, and illustration.  Context; the Wikipedia entry: Sugarloaf

Illustration:

That's why so many mountains, hills, peaks, etc. are named "Sugar Loaf".  Because they look like that.