In fact, it's believed to bethe largest earthwork effigy mound in the world,and nobody...
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In fact, it's believed to be
the largest earthwork effigy mound in the world,
and nobody knows what it's for
the largest earthwork effigy mound in the world,
and nobody knows what it's for
Full Transcript
00:00:01.000 --> 00:00:04.048
In fact, it's believed to be
the largest earthwork effigy mound
00:00:04.056 --> 00:00:08.999
in the world,
and nobody knows what it's for.
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Movie Summary
Using cutting-edge technologies such as ground penetrating radar (GPR), LIDAR (Light Detection and Ranging), and 3-D imaging, scientists research fascinating underworlds of secret tunnel networks, ancient structures, and bizarre g...
