The Bolshoi Zayatsky Labyrinths

Found on a small island off the coast of Russia, less than one square mile in size, are these labyrinths. Dating back to 30,000 BC, these stone heaps and earthen mounds cover most of the island.

No one knows who built them or what the purpose of the labyrinths were. Odds are, it was for a religious or ritualistic ceremony.