Indonesia's Kawah Ijen volcano looks like any other while the sun is up in the sky. When nighttime comes, the mood shifts to something surreal, as the volcano's sulfur-laden lava burns off an aura of azure. It breaks through the dark of night like the light at the end of a tunnel.

The other-worldly images were captured by French photographer Olivier Grunewald last year, and in an interview with National Geographic, he mentioned that "this blue glow — unusual for a volcano — isn't, of course, lava." He continues in a statement to Smithsonian Magazine, "It is due to the combustion of sulfuric gases in contact with air at temperatures above 360°C."

Grunewald works with his partner, Bernadette Gilbertas, a journalist, to tell amazing stories around the world. The clip below is what they ended up with on this trip to Southeast Asia, and the footage speaks for itself.

Check out their incredible set of images below, and when it's finished playing, tell us what you thought in the comment. Be sure to share it with your friends on Facebook!