Armenian tuff, forged from volcanic ash, comes in three distinct types—travertine (a limestone cousin ... and finely-cut tufa shingles—a design both practical and symbolic.

Whether you are looking for the turquoise pools of travertine hot springs or the luxurious ... including limestone tufa towers and alkaline waters. While Mono Lake itself is not a hot springs ...

Sheer drama. That’s what the Great Sand Dunes are. Starkly beautiful desert dunes set against a backdrop of pretty, ...

The geyser has created a bunch of travertine terraces ... its most surreal feature is the tufa towers. These otherworldly-looking limestone spires erupt out of the water like alien sculptures.