Two gigantic canyons on the moon — both deeper than the Grand Canyon — were carved in less than 10 minutes by floods of rocks ...

New research reveals that two massive lunar canyons, deeper than the Grand Canyon, were formed in under 10 minutes by intense ...

In 1908, explorer G.E. Kincaid made a shocking discovery in the Grand Canyon: a man-made cavern with hundreds of carved steps ...

Two Grand Canyon-size features on the far side of the moon were likely formed in about 10 minutes after an unknown object ...

Arizona's magnificent Grand Canyon is painstaking result of the Colorado River's current wearing away the planet's surface ...

He is a Carnegie Foundation Senior Fellow and National Geographic Society Explorer. He lives in his work-in-progress ... Her favorite activities are hiking in the Grand Canyon and visiting other parks ...

I like every type of train journey, from luxury long-distance journeys to short, scenic jaunts on public transport. Here are ...

There are alot of great caves in the US but there is a hot debate over which one is better Mammoth Cave or Carlsbad Caverns.

From sandy beaches to mountain summits to sparkling lakes, Virginia just seems to have it all. Here are the 20 most beautiful ...

With a vast expanse of natural splendor, South Dakota is rich in history, outdoor experiences and unique activities. In the Mount Rushmore State, visitors will find two of the world's longest ...