"I don't know; therefore, aliens"
"Sometimes" it goes over the top...?? I think it *always* goes over the top. The speculation is always fun, but these guys seem totally incapable of using words like "maybe," "could be," and "possibly"....instead, they deal in absolutes. Like it's common knowledge that the aliens were here and did this and did that.
There's plenty of mysteries in the ancient world, but quite a bit of this is just simply modern man
completely underestimating ancient man. For instance, whenever someone discovers that an ancient site has very definite astronomical and calendrical qualities to it (Stonehenge, Copan and the like), they automatically jump to the conclusion that the only reason humans could have or want advanced astronomical knowledge is to "communicate with the Star People." Here's a simpler explanation: it was the dawn of agriculture. Farmers need to know when to plant and when to harvest, so they need a calendar, and they need to know when to expect solstices and equinoxes and plan their crops accordingly. Ever look at a Farmer's Almanac....? Not exactly hi-tech stuff, but it's filled with astronomical info that's important to the planting and harvesting season.