Salt is not only one of the world's most basic commodities, it was also amongst the first to be intensively mined. In earlier times it was essential for food preservation, and access to steady supply was crucial to obtaining adequate nutrition. In this video, contributor and drone pilot BK Spector flew a drone over an ancient salt mine in Israel. It's part of Mt. Sodom, a mountain in Israel's Judean Desert. The mountain is 80% salt by composition, and was a key source of the commodity in Biblical times.