Hikers in New Zealand risk polluting the “clearest lake in the world” with a microscopic alga carried on their boots.

A scary-looking creature with “devil” in its name was spotted close to the surface off Tenerife, a Spanish island.

Travel like a local: Residents share their favorite places in our top city guides: New Orleans, Rome, Tokyo and Mexico City.

Dr. Luis Buatois (Ph.D.) traces a series of hexagons with his finger, following the path carved by tiny organisms millions of ...

Looking for some bucket-list travel ideas? You can't go wrong with these natural wonders—though you might not believe your ...

Imagine creatures that have survived since the time of dinosaurs. Species like the tuatara, sturgeon, crocodile, hagfish, ...