Deep inside the river cave, the water suddenly drops away into a dark blue hole so deep that even the camera can’t find the ...

A number of ancient Roman statues might lie beneath the turquoise waters of the Blue Grotto on the island of Capri in southern Italy, according to an underwater survey of the sea cave. Dating to the ...

A state park in eastern Kentucky is throwing a summer party pool, but instead of being under the sun, it'll be deep inside a cave. This year, Carter Caves State Resort Park is opening up Cave Branch ...