The "Pyramid of the Moon" at Teotihuacán, the site of an ancient city near modern-day Mexico City, is aligned with the sun on the summer and winter solstices, a research team in Mexico says. However, ...

Two voids detected on the eastern side of the Pyramid of Menkaure on Egypt's Giza plateau hint at a second, hidden entrance to the pyramid, according to a new study. The pyramid was built during the ...