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For modern archaeologists, the ancient world continues to hold many secrets. Civilizations disappear, and thousands of years later, researchers are left to pick through the ivy-covered ruins of their cities.

The following are a list of awe-inspiring sights whose codes haven’t been cracked yet. Who built them? Why did they build them? Did humans even build them at all?

• Easter Island: Without materials for making rope or lumber, visitors wondered, how could the early inhabitants of Easter have mounted these enormous sculptures into place?
• The Yonaguni Monument: It could be a random pile of rocks, or it could be the Asian Atlantis. Located just off the shores of Yonaguni, one of Japan’s most southerly islands, the Yonaguni Monument is a vast collection of stone structures believed by some to be the sunken remnants of an ancient civilization.

Full list at HowStuffWorks.com.

Total aggregation of HowStuffWorks.com.

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