Ushguli, Georgia, is a living museum of medieval towers set high among the green valleys of the Caucasus Mountains.

The partial collapse of the Torre di Conti has sparked a negligence probe and renewed fears about how the Eternal City protects — and fails — its ancient heritage.

The fabled Tower Rock walkway has defied expectations and emerged from the Mississippi River's depths, triggering worries among water experts.

CHENGDU -- On Haizi Mountain in Daocheng in Southwest China's Sichuan province, with an average altitude over 4,400 meters, a ...