Lawrence Person's Futuramen

It’s not often hear of legendary American creature previously unknown to me, but I hadn’t heard of The Dark Watchers before I stumbled across this

“The Dark Watchers are described as tall, sometimes giant-sized featureless dark silhouettes often adorned with brimmed hats or walking sticks. They are most often reported to be seen in the hours around twilight and dawn. They are said to motionlessly watch travelers from the horizon along the Santa Lucia Mountain Range. According to legend, no one has seen one up close and if someone were to approach them, they disappear.”

Here’s a page of firsthand accounts.