Baigong Pipes / Antikythera Device / Arctic Forest
This is great fodder for Ancient Astronaut theorists. Over in China is a pyramid that has iron pipes within it, and heaps of pipes laying about outside. Like many such mysteries, the pipes could actually be naturally occurring – and Wikipedia cites similar, natural examples. But combined with a pyramid, that’s interesting!
According to Skeptoid, they are fossilized trees, and this seems to ring true (pardon the tree pun)
Seems that the beautiful theory that either Hipparchus or Archimedes designed the Antikythera device is wrong. The way it works suggests that the concept comes from the Babylonians / Sumerians. Increasingly they are looking like the fulcrum of ancient knowledge…
Speaking of fossilized trees, adding to the body of evidence for an ancient crustal displacement (aka pole shift) is another forest found in the Arctic, where it could not possibly have grown today.