Underground Worlds unearths the hidden history beneath our feet, exploring subterranean cities, tunnels, and bunkers that reveal human resilience. These aren't just holes in the ground; they're testaments to survival strategies, like the ancient city of Derinkuyu, built to withstand external threats, and Cold War bunkers, reflecting anxieties of a nuclear age. From architecture to history, the book examines the motivations and ingenuity behind these constructions, showcasing how societies have adapted to adversity throughout time.

The book's approach bridges history, archaeology, and architecture to understand human motivations, rather than simply cataloging structures. Examining wartime tunnel systems like the Cu Chi tunnels, the book analyzes their strategic role in military campaigns.

Progressing chapter by chapter, the book moves from ancient cities to modern survival bunkers, revealing how underground spaces reflect broader societal trends and anxieties.