NAGO, Okinawa Prefecture--A treasure trove of rare limestone structures has been found in a small cave system on Nagashima, an islet off the Henoko district of this southern city, a group of ...

These are the most beautiful limestone caves in all of Australia ... helictites and flowstone shawls. Castle Cave tours are also available from the Visitor’s Centre and is ideal for birdwatchers.

Under a swath of Kentucky hills and hollows is a limestone labyrinth that became the heartland of a national park. The surface of Mammoth Cave National Park encompasses about 80 square miles.