Haa..The pyramids. Many stories surround these magnificent pieces of ancient architecture.
Not only are most of them supposedly said to have coincidences with some of our major mathematical figures today (like Pi, Speed of light, dimension of the planet, axial changes) and relationships with many astronomical references, but it's also being discovered that some of them also are setup in something that seems like a straight line despite being continents apart. Almost as if the ancients were able to get an eye view of the planet from space.
Aliens? I don't know..but heck they are astonishing.
Sudan is said to have more pyramids than Egypt btw.