In a remote corner of the U.S., active volcanoes wait patiently above the ridgelines, leaving residents on edge.

There are no reports of flights being cancelled, but airlines are apparently operating with restrictions because ash clouds ...

Not all mountains in the Yellowstone region are volcanic in origin. The Wind River Range, southeast of Yellowstone National ...

Video footage captured by Scott Malis during the volcano's 11th episode shows lava spewing out of Kilauea volcano and spinning into the air.

Arizona's highest point is near Flagstaff and provides scenic views. Here's what to know about the tallest mountain, including elevation and hiking.