No, this isn't some St. Patrick's Day joke. Researchers say that Yellowstone National Park's world-famous Morning Glory thermal pool is turning a yellowish-green by decades of tourists throwing ...

The Morning Glory Pool — perched near the famous “Old Faithful” geyser — was for years a must-see attraction in the Upper Geyser Basin in Yellowstone National Park, according to Cowboy ...

Former Yellowstone ranger Jeff Henry, who first visited the park as an infant and later spent decades working there, participated in a rare project to clean the Morning Glory Pool in 1991.

Yellowstone National Park tourists have been blamed for ruining a once pristine, crystal- blue thermal pool by treating it like a wishing well for decades. Morning Glory Pool is a thermal pool in ...

Former Yellowstone ranger Jeff Henry, who has worked in the park for nearly 50 years, was part of the last team to clean out Morning Glory Pool in 1991. Though, he said it won't happen again.

Yellowstone National Park’s famous geothermal pool named Morning Glory has reportedly changed color due to the volume of debris thrown in by visitors. According to park historians and former ...

This photograph of Morning Glory Pool in Yellowstone taken in 2013 shows the pool after it lost the deep blue color that prompted its name.

Morning Glory thermal spring, in Yellowstone National Park (photo taken in August 2012). Credit: Joseph Shaw, Montana State University. For decades, visitors have been captivated by the burst of ...

YELLOWSTONE NATIONAL PARK – If Morning Glory Pool just isn’t blue enough for you anymore, I found a good stand-in. True blue. Bluer than a blueberry.

Former Yellowstone ranger Jeff Henry, who first visited the park as an infant and later spent decades working there, participated in a rare project to clean the Morning Glory Pool in 1991.

Yellowstone National Park’s famous geothermal pool named Morning Glory has reportedly changed color due to the volume of debris thrown in by visitors.. According to park historians and former ...