Videos from Yosemite National Park show the iconic "Firefall" phenomenon glowing at Horsetail Fall inside the park.

While volcanoes can be frightening, supervolcanoes are even scarier. These five supervolcanoes are proof of that, having ...

Monument Geyser Basin is one of the most unique areas of Yellowstone National Park. Its ancient undersea wasteland at 7,300 ...

For every Old Faithful and Grand Canyon of the Yellowstone, there's a host of other obscure places like The Gumper, Lactose ...