Gas comes at surface here since ancient time. Zoroastrian site near Baku - fire comes from the ground 24/7 here - it is one of the most important sites in the history of Zoroastrianism  Yanar Dag, translated as "Fire Mountain", is an ancient and visually stunning 10-meter (30 feet) wide wall of fire which blazes continuously on a hillside near Baku. Only a handful of fire mountains exist today and most are located in Azerbaijan. Due to the large concentration of natural gas under the Abseron Peninsula, natural flames have burned there throughout antiquity and been reported by historical writers such as Marco Polo. The naturally occurring fire burns most impressively at dusk, when both tourists and locals sit at a nearby teashop in an attempt to derive inspiration from the spectacular sight. Azerbaijan's frequent link with fire in its folklore and icons is credited with a connection to the ancient religion of Zoroastrianism, which first appeared in the region over 2,000 years ago.