[JoeProBono]

This is one of the many sulfuric sinkholes in Yellowstone National Park in Wyoming. Hundreds of small earthquakes there in recent weeks have been a reminder that underneath the park's famous geysers lurks one of the world's biggest volcanoes. The park is 40,000 years overdue for a major eruption.

[SunkenCiv]

The park is 40,000 years overdue for a major eruption.

"So, be sure to take the family to Yellowstone this summer! Could be the last vacation you ever take!"