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Watch National Geographic The Truth Behind online: Episode 2 Crop Circles

For centuries, strange and dramatic designs have appeared in crop fields throughout southern England. Are they alien messages or the work of human artists and hoaxers? Are they connected to Stonehenge and the area's sacred pagan sites? We examine several crop circle sites to look for anomalies and attempt to construct an elaborate crop circle at night to uncover the truth behind this fiercely disputed mystery.

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