Explore the secrets of the 7 wonders of the world, featuring the mysterious Maya city of Chichen Itza and the breathtaking Colosseum. This is part 2 of our series on the new wonders of the world.

A Sherlock Holmes-style investigation has revealed the ancient method for the stunning pigment known as Maya blue — and it's different from a previous method uncovered nearly 20 years ago by the same ...