Greece

In shallow water off the Greek island Zakynthos there is what could be the ruins of an old Greek or Roman city. When it was discovered, people thought it was a forgotten city that had been destroyed by tidal waves that hit the island long ago.

The phrase "do no harm" famously comes from the Hippocratic Oath, a piece of writing from ancient Greece, and is still a core aspect of medical ethics today. As its name suggests, the oath was ascribed to a doctor named Hippocrates early on, along with a sizable collection of other writings called the Hippocratic corpus.