Is this hollow mountain in Iran a natural wonder or a legendary demon prison?

Countries & Cities · Published 29 September 2026 Swipe more like this →

In short: Rising from the landscape of West Azerbaijan, the Prison of Solomon is a striking, cone-shaped hill with a massive, eighty-meter-deep pit at its center. While locals once believed the site served as a supernatural jail for demons, the truth behind its formation is a fascinating geological process of mineral sedimentation.

The structure known as Zendan-e Soleymān is not a man-made fortress but a geological curiosity. It originated from an artesian spring that once bubbled at the surface, forming a small pond. Over vast periods, lime and other minerals dissolved in the water settled around the edges of the pool. As the water overflowed, these minerals built up a wall that grew taller and thicker with every passing age, eventually creating the hollow, cone-shaped hill visible today. Once the spring finally dried up, it left behind the deep, empty crater that defines the site.

Despite its natural origins, the site has been a focal point for human activity for millennia. Located three kilometers west of Takht-e Soleymān, the area was enclosed by walls and hosted a Mannaean temple between 880 and 660 BCE. Its religious significance deepened significantly during the early 5th century CE, coinciding with the rise of the nearby Takht-e Soleymān as a major Zoroastrian center. The name Prison of Solomon itself reflects local folklore, which attributed the mysterious, cavernous structure to the legendary king who supposedly used the pit to imprison demons.

Today, the site is recognized for its historical and cultural value, officially listed as a national heritage site of Iran since March 15, 2001, under the registration number 3257. While it remains a subject of geological study, such as the 1968 work by Bernhard Damm, it is also a site of archaeological interest, documented by researchers like Wolfram Kleiss in 1971. The site stands as a testament to how natural formations can capture the human imagination, transforming a simple mineral deposit into a place of myth, legend, and profound historical importance.

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