A routine temperature check at the Norris Geyser Basin in Yellowstone National Park led geologists to discover a new blue ...

Emerald Cave, also known as Emerald Cove, shimmers with luminous green light. Here's the best time to visit Emerald Cave and ...

Hues of red, pink and cream give way to azure skies.

Visit Zion National Park in Utah and your gaze is immediately lifted upward to the pink, buff, and orange sandstone canyon ...