Shahdiz

Shahdiz - Credit: Wikimedia Commons

Dizkuh () or Shahdiz () was a fortress near Isfahan, Iran, notably held by the Nizari Ismailis. It was captured and destroyed in Seljuk sultan Muhammad Tapar's anti-Nizari campaign. Its conspicuous, picturesque ruins lie about 8km south of Isfahan on a subpeak of Mount Soffeh. Read more on Wikipedia

type: military installation
date from: 1107

Source: en.wikipedia.org