This mountain city in Bulgaria is known as the Machu Picchu of Europe but is less crowded and easier to get to, while still full of ancient mysteries.

Russian scientists have detected dangerously high levels of a carcinogen in soil samples taken from beaches contaminated by ...

Russia's beleaguered Black Sea Fleet has developed a "new method" of fending off persistent Ukrainian naval drone attacks, according to a new analysis. While most of its global naval forces remain ...