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The Acropolis above Athens has stood for thousands of years; scientists are working to solve its mysteries: how it was built, what it looked like, and how it has endured the test of time.
The Great Wall of China is the biggest man-made structure on Earth; the scientific mission to reveal the ancient secrets about the fortified wall.
Examining Cologne Cathedral, a medieval structure that may hold the remains of the Bible's Three Magi in the Shrine of the Three Kings. Also, Amiens Cathedral is used for some comparisons.