An excellent diving site, this incredible duo of caves is a favorite of both tourists and locals alike. The two caves—known as Cenote Dos Ojos—were created by two 70-foot sinkholes connected by a ...

Long before the Sumerians pressed reeds into clay, humans may have already taken their first steps toward writing. Forty thousand years ago, in the depths of Ice Age caves, people began leaving behind ...

Phong Nha-Kẻ Bàng National Park in Vietnam is billed as a successful example of sustainable tourism, with efforts to conserve the area’s unique caves and wildlife. The park’s management has ...

Mammoth Cave National Park in Kentucky is home to the world’s longest cave system, with over 426 miles of mapped underground passages. While here, visitors can hike the Cedar Sink Trail and explore an ...

Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...