These pale gray and ivory "tufa towers," located in California's Mono Lake, may look like eerie art instillations, but they occur naturally and are made of limestone. Check out more of these ...

The limestone settles around the spring and over hundreds of years, it solidifies and forms the tufa towers. The tufa will ...

Authorities were surprised by the elaborate style of the walls, which were constructed with diamond-shaped tufa (limestone) blocks placed in a net-like ornamental pattern about 70 centimeters (27.5 ...

Why it is tufa. Which is a giveaway to the place, of course: It's Mono Lake, "an ancient saline lake" dotted with globby, chunky tufa formations. Think limestone, but don't think of any limestone ...

The cave walls are 18-feet thick and made of tufa limestone. The cave was formed more than 25,000 years ago via glacial drifts on Lake Michigan, according to the resort.

The word also suggests the porous limestone, or tufa, that gives Mr. Marsicano’s home, and others in the area, their uniform, beige color.

Authorities were surprised by the elaborate style of the walls, which were constructed with diamond-shaped tufa (limestone) blocks placed in a net-like ornamental pattern about 70 centimeters (27. ...

Authorities were surprised by the elaborate style of the walls, which were constructed with diamond-shaped tufa (limestone) blocks placed in a net-like ornamental pattern about 70 centimeters (27. ...

A three-year project to build a children’s playground and recreation area south of the Italian city of Naples has unearthed the ruins of a 2,000-year-old clifftop beach house. Built in the first ...