10 Prehistoric Clocks That Endure
10. Ishango Bone
9. Antikythera Mechanism
8. Megalithic Temples
7. Cave Paintings
6. Obelisks
5. Observatory of Goseck
4. Stonehenge
3. Candle Clocks
2. Water Clocks
1. Sundials
10 Ancient Timekeepers That Remain Relevant
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