Sodom stood for 1000s of years as a powerful lesson of the perils of wickedness. According to the Bible, the men of Sodom were so wicked that God destroyed the city in a shower of fire and brimstone. But did the city of Sodom ever exist?

8000 years ago, a lush paradise, home to mammoth, deer, and hunter-gatherers connected Britain and mainland Europe - Doggerland. It was wiped out by a single devastating event, leaving it hidden beneath the waves of the North Sea.

In 373 BCE the Greek city of Helike disappeared beneath the waves. In myths, Poseidon destroyed it. It's hauntingly similar the story of Atlantis. Could it be possible to rediscover the lost city and could Helike actually be Atlantis?

In 2334 BCE the Akkadians conquered and united the Sumerian city state kingdoms to create the world's first empire. After only 140 years the Akkadian Empire fractured. Why did they collapse?

In 1,200 BCE the Hittite Empire, the Mycenaeans, and the Egyptian Empire imploded and the Bronze Age period of history collapsed. What, or who, was to blame? Evidence points to what is known as the Sea People. Were they responsible?

Between 250 and 900 CE the Maya civilization perfected mathematics, astronomy, architecture and the calendar. From around 900 CE the Maya's luck ran out and their great cities were largely abandoned. Why?