For just two weeks at the end of February, hundreds of people gather at Yosemite National Park for something very special. With just the right conditions, the Horsetail Fall down El Capitan glows ...

Fountains dropped in height 250 feet (80 meters) to 300 feet (90 meters) on Tuesday night, according to the Hawaii Volcano Observatory. On Wednesday morning, a webcam still showed tall bursts of fiery ...

Horsetail Fall, a seasonal waterfall on the eastern side ... turning it into a vibrant orange and red streak, resembling molten lava. The Firefall typically occurs from mid to late February ...

In these flows, the lava erupts at temperatures of around 1,100 to 1,250°C (2,012 to 2,282°F). At Ol Doinyo Lengai, the lava erupts at a much cooler 510°C (950°F).

“As darkness falls, the situation becomes extremely dangerous ... Content continues below Lava isn't the only threat: When thermal energy spews from a volcano, large rocks can be violently ...