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New scan data of the Baltic Sea UFO Rock reveals intriguing geometric shapes and unexpected features—could this be nature or something more mysterious? Discover the details inside.

Nan madol ancient ruins sit on a Micronesian reef with basalt columns nobody can trace to a quarry. See who built it and why transport stays unsolved.

Who built Stonehenge? Neolithic Britons did, but moving the 25-ton stones 150 miles without wheels is still fiercely debated among archaeologists today.