For years, Egyptologists have hotly debated how the massive pyramids of ancient Egypt were built more than 4,000 years ago. Now, a team of engineers and geologists brings a new theory to the table — a ...

Pictures: New Pyramid Found With Vivid Murals, Stacked Tombs With tombs stacked three high—including one with vibrant murals—a newfound pyramid in Mexico is a rarity of the ancient Zapotec culture.

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For years, Egyptologists have hotly debated how the massive pyramids of ancient Egypt were built more than 4,000 years ago. Now, a team of engineers and geologists brings a new theory to the table — a ...