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 ...

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 ...