1: 1. The ancient Inca used a complex system of knotted strings as a form of communication and record keeping.

2: 2. The Olmec civilization in Mesoamerica developed the first writing system in the Americas.

3: 3. The ancient Egyptians built the Great Pyramid of Giza using complex mathematical calculations.

4: 4. The Mayans were skilled astronomers who developed a complex calendar system.

5: 5. The city of Petra in Jordan was once a thriving trade hub for the Nabateans.

6: 6. The mysterious Nazca Lines in Peru are giant geoglyphs that can only be seen from above.

7: 7. The ancient city of Pompeii was buried under ash and pumice after the eruption of Mount Vesuvius in 79 AD.

8: 8. The Indus Valley civilization had a sophisticated sewage system that was ahead of its time.

9: 9. The lost city of Atlantis, mentioned by Plato, continues to capture the imagination of people around the world.

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