Tower Rock, a limestone formation in the middle of the Mississippi River, is newly accessible by foot. The destination is now popular with tourists, the Missouri Department of Conservation said. The ...

Looks like limestone’s on the menu for some unknown microbe.

You would have a hard time finding these common Earth rocks on our neighboring planets. Here’s what makes our landscapes so unique. Limestone landscapes, like this one in the Stone Forest in China’s ...

Two limestone rock walls narrow to a tiny crevice near the Red Waterfront Trail at Lake Mineral Wells State Park and Trailway. Lichens and moss cover the rock face, and a few thorny bushes grow by the ...