The gigantic Yellowstone Grand Canyon, lined with volcanic rock. With all the effects of hydrothermal activity, river erosion ...

The Greek island has a long history of earthquakes, but what is causing the recent series of quakes has scientists perplexed.

The National Park Conservation Association has identified 13 national monuments it considers at risk after a recent Interior Department order.

Mauna Loa, the world's largest active volcano, is the mighty giant of Hawaii that's still bubbling away, waiting to be explored.

From Alaska to Wyoming, here are the best places to see bears in the wild across the U.S., including when to go and tips for ...

Trump said he is also stopping Biden's access to daily intelligence briefings. President Donald Trump's second administration continues its swift recasting of the federal government, prompting ...