Maybe it’s because I spend a fair amount of time around construction sites that articles like this jump out at me. Quite often, discoveries of ancient structures bring about the question, how did they do it? Which is usually met with the reply, it’s unbelievable or even impossible. According to the excavation director of the wall in Israel, "To build straight walls up 8 meters ... I don't know how to do it today without mechanical equipment … I don't think that any engineer today without electrical power [could] do it."
Which brings me to the mystery of Stonehenge. Every few years a documentary will spring up claiming it couldn’t have been done by humans with their limited technology. Aliens must have helped. Well, this guy demonstrates how it was probably constructed (hat tip to Francis Callahan for the link). End of mystery, right? I doubt it. The question will likely come up time and time again because it seems each generation has to learn it for themselves.
Now, here’s a mystery that really fascinates me, the 2,000 year old battery. Have its origins ever been figured out? And please tell me we didn't destroy it in the last couple wars.