This little-known park has miles of underground caverns, some of which are normally open for tours (in real life and virtually), plus hiking trails to explore.

Add Yahoo as a preferred source to see more of our stories on Google. In this handout photo provided by the National Institute of Anthropology and History, underwater archaeologist Octavio del Río ...

A newly discovered Triassic reptile from the UK looked more like a racing greyhound than a crocodile, built for speed on land ...

On September 12, 1940, a dog in France stumbled upon one of the most remarkable archaeological finds of the 20th century. The rest of this article is behind a paywall. Please sign in or subscribe to ...

MEXICO CITY — A prehistoric skeleton has been found in an intricate underwater cave system along Mexico’s Caribbean coast, an area that flooded at the end of the last ice age 8,000 years ago, ...

Limestone cliffs and cave systems hold clues to a prehistoric ocean.

In this handout photo provided by the National Institute of Anthropology and History, underwater archaeologist Octavio del Río takes photos of the remains of a prehistoric human skeleton discovered ...