Hidden Beneath the Cities uncovers the extraordinary worlds lying just below modern urban centers. Beneath the streets of stone, soil and concrete exist hidden realms shaped by survival, ritual and imagination. Episodes reveal Malta's Ħal Saflieni Hypogeum, with its 5,000-year-old burial chambers; Turkey's vast caves in Midyat, which sheltered whole communities; and Iran's qanats, which sustain desert life.