Bay of Aarhus, Denmark — Below the dark blue waters of the Bay of Aarhus in northern Denmark, archaeologists search for coastal settlements swallowed by rising sea levels more than 8,500 years ago.

Archaeologists have discovered an underwater city in Denmark's Bay of Aarhus, which is being hailed as the Stone Age Atlantis. The team uncovered animal bones, stone tools, arrowheads, a seal tooth ...