7. The Disappearance of the Indus Valley Civilization
The Indus Valley Civilization flourished for centuries, boasting advanced urban planning and impressive architecture. Yet, around 1900 BCE, it mysteriously declined and vanished. The reasons—climate change, invasion, disease, or internal strife—remain hotly debated. Adding to the enigma, the civilization’s script is still undeciphered, making it difficult to unlock their secrets.
