Ancient artifacts and ruins all over the world have made many scientists question whether our currently accepted understanding of prehistory is correct. Here’s a look at some sites that have thrown a wrench in the old paradigm, remaining unexplained to this day. They seem to exhibit evidence of prehistoric civilizations far more advanced than scientists…

The Red Planet never fails to surprise us: first there was a pyramid, then there was a mystery woman, and then a smiley face. Now we have a doorway to an ancient temple. Of course, experts will say all these are only illusions. NASA’s Curiosity Rover took the picture of a “natural rock formation” in…

WASHINGTON—A glyph representing a day called “7 Deer” on mural fragments dating from the third century BC found inside the ruins of a pyramid in Guatemala marks the earliest-known use of the Maya calendar, one of this ancient culture’s renowned achievements. The fragments were found at the San Bartolo archeological site in the jungles of…