Known as “Thunderball Grotto,” this secluded, dramatic cave of jagged limestone, illuminated by sun rays peering down through natural holes in the ceiling, looks like a movie set.

A small island that's part of the Bahamian "Sister Islands," Staniel Cay is located in the Exumas about 75 miles south of Nassau and is best known as the location of the Thunderball Grotto, a ...