Watch the fires of Azerbaijan burn

Witness natural gas fires that have burned continuously for thousands of years, creating an otherworldly landscape of eternal flames dancing from the earth. These 'burning mountains' and fire springs occur where natural gas seeps through porous rock and ignites, creating a phenomenon that inspired the ancient Zoroastrian fire-worshipping religion. The largest site, Yanar Dag, burns brightest at night, creating an mesmerizing natural torch against the darkness.