There are few real mysteries left to archaeologists anymore. Stone Henge is one, it wasn't made for or by aliens, that's just stupid, but it's real use is lost to antiquity. Sure, we (by "we" I mean actual achaeologists and hitorians, possibly Tony Robinson too, but not me or you dear reader) can have educated guesses, but that's all they are, guesses. Peru has the Nazca Lines fill the role of antiquity puzzler. These are lines, no more than 50cm wide, carved in to the surface of the desert. Some are shaped like animals or humans but most are straight lines. They are visible only from a height and are rather large. We decided against taking a flight over the desert; it's expensive, we'd had mixed reviews and the safety record of some companies is questionable.
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