Of the thousands of eternal flames across the globe, most are man-made, created either for religious reasons or to honor history's famous, such as Virginia's John F. Kennedy Memorial. But eternal flames that occur naturally are harder to come by.
Often ignited by lightning or humans, these flames need to live in a specific environment where the gas source isn't at risk of being burnt away or destroyed. Here's a look at a few fascinating and lesser known natural eternal flames around the world, some of which have been burning for centuries.
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