And while some have called it a sinkhole, it actually appears to be a sea cave. This curious natural phenomenon formed over thousands of years as waves ate into the volcanic rock on Cape Perpetua ...

Navigating lava rock can be perilous ... of Hawaii’s lava tubes have been mapped. “The deep sea, outer space, and caves: Those are the only frontiers left,” says Coons, who does his ...

Caves are magnificent and mysterious at the same time. The Western Cape has various beautiful caves by the sea that visitors ...

These sea caves can be found on 0.5-mile hike in New England - but it is only accessible until March (when it is frozen).

These caves show evidence of a change in sea levels that took place thousands of years ago. The caves once existed above the water line, but were flooded when sea levels rose. Deep within these ...

Divers found colorful sea creatures with “large” eyes ... including an underwater cave, near “stones and rock,” on the sand and in algae. Wittmann said he named the new species after ...

Reaching up to 300m, Tasmania's sea cliffs are some of the highest in the world. Beneath the cliffs of Waterfall Bay is a vast network of underground caves carved out over several million years of ...