The Khewra Salt Mine is one of the largest and oldest salt mines in the world, located in the Khewra region of Pakistan. Discovered in 326 BC by the troops of Alexander the Great, the mine produces high-quality rock salt, which is harvested and processed for various uses, including cooking and industrial applications. Spanning over 110 square miles, the mine features extensive tunnels and chambers, some of which are open to tourists. Visitors can explore the stunning salt formations and learn about the mining process, making it a popular destination for both locals and international travelers interested in natural wonders.