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In an area of China not known to ever contain people, let alone industry, there are three mysterious triangular openings on top of a mountain containing hundreds of ancient rusty iron pipes of unknown origin. Some of the pipes go deep into the mountain. Some of them go into a nearby salt water lake. There are more pipes in the lake, and more still running east-west along the lake shore. Some of the larger pipes are 40 cm in diameter, are of uniform size and are placed in what seems like purposeful patterns.
Cracked.com | 6 Insane Discoveries That Science Can't Explain

In the past God overlooked such ignorance, but now he commands all people everywhere to repent.

In addition to the twelve main gods and the innumerable lesser deities, ancient Greeks worshiped a deity they called Agnostos Theos, that is: the Unknown god. In Athens, there was a temple specifically dedicated to that god and very often Athenians would swear "in the name of the Unknown god" (Νή τόν Άγνωστον Ne ton Agnoston). Apollodorus, Philostratus and Pausanias wrote about the Unknown god as well. The Unknown god was not so much a specific deity, but a placeholder, for whatever god or gods actually existed but whose name and nature were not revealed to the Athenians or the Hellenized world at large.

Wikipedia | Unknown God