Niède Guidon, the Brazilian archaeologist known for discovering hundreds of prehistoric cave paintings in northeastern Brazil and for her research challenging theories of ancient human ...

North America's deepest gorge, Hells Canyon, which slithers along the border of Idaho and Oregon, is a surprisingly new ...

The story involves an inland sea, powerful rivers, the shearing of the Earth’s crust along major fault systems, magmatic ...

While most people are preoccupied with what’s happening above ground in the Mount Shasta area, very few people think to ...

While many travel destinations are becoming overrun with tourists, there are still some beautiful hidden gems in the US from ...

You had to hold your breath and dive a little to get through.” That’s how speleologist Katiya Pavlova summarized the ...