We reveal the centuries-old secrets and mysteries of one of the most remarkable examples of Victorian engineering. Follow the cutting-edge technology that built the Palace of Westminster, including Big Ben, and find how it paved the way for the today's skyscrapers.

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.

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.

New evidence could help solve some of the Great Pyramid's mysteries; the investigation into how it was built, revealing the truth about hidden tombs and deepest secrets.

The series premiere examines the lost city of Chichen Itza in Mexico, which contains ancient secrets of a mysterious civilization. Included: how it was built and how human sacrifice shaped the city.