Picture it: Ancient Egypt, Greece, and Rome. Thousands of years ago. People in these regions were so far ahead of their time, they were using things that we continue to use this very day. Most common among them? Peppermint. Multi-purpose and strong, peppermint was so valuable, it was even used as a form of currency in the Western Roman Empire. Although no longer used as currency, peppermint and its oil remain invaluable and unfallen.