The limestone cavern became not only a place of refuge but also a satisfactory home.

In 1909, three local children were lost in the underground limestone caverns underneath the town of Newton.

The lake itself is full of limestone caverns and there are many springs where water gushes forth from the earth.

Soon it opened up into a large limestone cavern.

She realized that they had entered a natural limestone cavern.

A limestone cavern, it claims the distinction of being America's oldest show cave, in operation since 1806.

But he said the structures were built around a water reservoir in a limestone cavern and collapsed from their own weight.

A train takes visitors through the limestone caverns stretching 150ft below ground.

Below them lie the Pits, a mix of limestone cavern and wartime construction far beneath the old city.

Some of the limestone caverns are open to the public.