Why it's incredible: El Cono stands alone in the rainforest and has a mysterious pyramidal shape. Cerro El Cono is a 1,310-foot-tall (400 meters), pyramid-like formation in the Amazon rainforest. It ...

Egypt, third millennium b.c. The Great Pyramid of Giza is both the oldest of the Seven Wonders and the only one still standing. Built by the pharaoh Khufu (reigned ca. 2551–2528 b.c.) to serve as his ...

The researchers who claimed to have found a vast underground city beneath Egypt’s Great Pyramids doubled down on the wild theory Tuesday by saying they’ve found a second “hidden city.” Italian and ...

The pyramids may have been built using a sophisticated hydraulic system, according to a new study in Egypt. Evidence of ancient Egyptians using water pressure to lift stone blocks was discovered at ...

Two Italian scientists claim to have discovered 38,000-year-old structures buried deep beneath the pyramids. But there's a big reason to be skeptical. A pair of researchers has claimed to find ...