The Morning Glory thermal pool, a once-pristine, brilliant blue thermal feature in the park's Upper Geyser Basin has been transformed over the years as visitors have thrown things into its waters.

Tourists have ruined one of Yellowstone’s most gorgeous thermal pools — turning its ... officials said. The Morning Glory Pool — perched near the famous Old Faithful geyser — was for ...

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 ...

However, after decades of visitors throwing coins, trash, and other debris into it, Morning Glory now resembles many of the other prismatic thermal pools found within the park, with a deep ...

One of Yellowstone National Park's most iconic attractions has been permanently changed by tourists. The Morning Glory thermal pool, a once-pristine, brilliant blue thermal feature in the park's Upper ...

The Morning Glory Pool — perched near the famous ... that gives humans a weird instinct to throw things into it.” The thermal pool’s changing temperature is likely a big reason its ...