Sinkholes are dramatic geological occurrences caused by the rock below the land surface dissolving and opening up the ground to leave mysterious, remarkably big caverns that have been known to ...

The cave that the Kanohina system seems poised to supplant in the record books is on the other side of the Big Island. It was likely created during a 15th-century eruption of a different volcano ...

This cave on a hillside near Tarbox Pond may have been a winter shelter for the Narragansetts. Find out why it's also known as "Witch's Cave." ...