Dust from the Sahara Desert, once a massive lake, travels across the Atlantic Ocean. This dust, rich in potassium and iron from dead diatoms, fertilizes the Amazon rainforest. The Amazon River ...

I trekked through the Sahara Desert with my in-laws after only meeting them a few times. I was nervous, but it was a fantastic trip.

The desert is where the Earth's coldest temperature ever was recorded and some areas haven't seen rain in more than 14 million years.

Egypt's Whale Valley, or "Wadi Al-Hitan" in Arabic, holds more than 400 primitive whale skeletons that offer a snapshot of the evolution of these creatures from land-based to marine animals.