Situated steps from Mackinac Island’s most famous geological formation is a new nature center that fits seamlessly into its surroundings. The Milliken Nature Center opened to the public last summer ...

The limestone islands of the Florida Keys are a tropical paradise. The Florida Keys have some magnificent waters. Pavel Polyakov / 500px/Getty Images ...

Rock Islands Southern Lagoon covers 100,200 ha and includes 445 uninhabited limestone islands of volcanic origin. Many of them display unique mushroom-like shapes in turquoise lagoons surrounded by ...

"At the time, over 200 million years ago, the U.K. was near the equator, and much of England was flooded, leaving limestone islands peeping through the warm seas—something like Florida today.

The low-lying limestone island of Anguilla is small and serene, a perfect spot for vacationers looking to enjoy the privacy of small-island life. Just 16 miles long and about 3 miles wide ...

The Aran Islands are a 10-minute flight or two-hour ferry ride from Galway, the main town on Ireland’s west coast. Three limestone islands make up the Aran Islands: Inishmore, Inishmaan, and ...