Mineral deposits in limestone caves in Saudi Arabia show that the now arid Saharo-Arabian Desert experienced increased ...

Isotope analyses of limestone cave deposits reveal recurrent humid intervals in the Saharo-Arabian Desert over the last eight ...

Several rivers across the world have mysteriously vanished underground or flow beneath the surface for miles, puzzling ...

This famous bay in Vietnam has inspired local legends and is a magnet for water adventures and relaxation. Here's what to ...

Hidden within the emerald folds of the Ozarks lies a natural masterpiece so spectacular it seems almost mythical – Hemmed-In ...