For centuries, Iran has relied on two natural geographic defensive barriers: the towering mountain ranges. Throughout history they’ve forced enemy armies into narrow easily defended passages. But today these mountains serve a new purpose – they shield Iran’s underground missile bases and nuclear facilities. How has Tehran turned these ancient formations into modern-day fortresses? Can U.S. its allies penetrate these defenses? And what secrets are hidden deep within these tunnels? Take a look at the Imam Ali Missile Base. It’s located in (kho-rah-mah-BAHD) Khorramabad and it’s the largest of its kind in Iran. This heavily guarded complex consists of two main components: a storage facility for hundreds of munitions and a separate missile launch facility. The base is strategically located in the western part of the country, because this positions it closer to launch strikes into Israel and Iraq. It’s inside the 1,500 km long Zagros mountains which extend from the northwestern to southwestern part of the nation. Over the past 30 years, their military has carefully constructed a network of these bases. Iran has not revealed exactly how many underground bases they have but open source intelligence and satellite imagery has led to some estimates of between 25 and 50. The entire command and control of these spread out assets is located at their oldest site, the Panj Pelleh headquarters.