Dune — Frank Herbert (1965)

Dune dominates the genre as the best-selling science fiction novel of all time, with over 20 million copies sold worldwide, and it outperforms #2 (1984) in sheer influence across film, fantasy, and political discourse. Set on the desert planet Arrakis, Frank Herbert weaves a dense narrative of colonialism, religion, ecology, and power within an interstellar feudal civilization, introducing concepts like spice melange and sandworms that have become cultural touchstones. Its impact is immeasurable: Star Wars borrowed heavily from its political and ecological themes, and it remains a benchmark for world-building, averaging a 4.2 rating on Goodreads from over 1.5 million reviews. This novel is not just a story but a foundational text that shaped the entire genre.