For years, people living near the Albanian-Greek border had little reason to suspect that an immense body of warm water lay concealed beneath the mountains around them. The landscape gave away only small hints.

Largest underground lake on Earth: Scientists have uncovered Lake Neuron, the largest underground thermal lake in the Atmos Cave of southern Albania, revealing an extensive…

For years, people living near the Albanian-Greek border had little reason to suspect that an immense body of warm water lay concealed beneath the mountains around them. The…