We may receive a commission on purchases made from links. Crystal blue waters give way to worlds of aquatic wonders off the coasts of the Hawaiian Islands. Though sea cliffs and strong ...

A crescent-shaped volcano crater that is partially submerged, Molokini doesn't feature sandbars, meaning the water clarity is superior to some of the other snorkeling spots around the island.

Scientists are on high alert after spotting a key sign that a US volcano is about to erupt. Huge plumes of steam have been seen rising from Mount Spurr, one of Alaska's largest active volcanoes.

Experts have recorded increased gas emissions and newly reactive gas fissures (or fumaroles) at Crater Peek and ... March 7 suggest that an eruption may occur in the next few weeks to months ...