9 Prehistoric Sun Shadow Clocks Identified

9. Bronze Age Megaliths of Europe

8. Ancient Chinese Observatories

7. Native American Medicine Wheels

6. Mesoamerican Sun Temples

5. Stone Circles of the British Isles

4. Indus Valley Civilization

3. Megalithic Temples of Malta

2. Neolithic Stone Monuments

1. Ancient Egyptian Sundials

11 Ancient Water Clocks of Antiquity