The towers were not built by anyone, nature made them. Over many thousands of years, rain slowly washed away the soft soil of the hillside, but wherever a hard rock sat on top, it acted like an umbrella and protected the earth beneath it. The protected columns were left standing tall while everything around them washed away.
The pillars keep changing very slowly. Some grow taller as more soil washes off, while old ones tumble and new ones appear. It is a place that is always, very gently, being reshaped by water and weather.
People long ago thought such a strange place must be magical, so they made up legends about it, which is how it got its dramatic name. Today it is a protected natural monument that visitors hike to see, careful not to disturb the fragile stone towers.