The firefall at Yosemite | Amazing phenomenon …

Tourists gather in Yosemite National Park, California, to witness a curious phenomenon: the waterfall known as the "ponytail". It is an optical phenomenon that gives the sensation of seeing a thin line of burning lava fall on the side of the hill. In reality, the image is produced by sunlight, which filters in the waters and makes them bright.

The phenomenon is very specific. It occurs only in winter or spring, with heavy rainfall and snow in February and March. The number of tourists wishing to attend the "ponytail" is so important that the National Park Service had to close the doors a year later.

Tourists especially approach with the idea to immortalize the moment, with a very short lapse of time, because it hardly lasts between five and ten minutes at dusk. The cameras say this and the social networks are full of photos of those who could capture the moment.