Title: 6 Insane Discoveries That Science Can't Explain
Media Form: Online magazine article
Topic: Anomalous Archaeology, Ancient Technology
Writer: Andy Guerriero through Cracked.com
Reader caution, this is Cracked.com, though their articles are well written and quite enlightening, they can be profane and vulgar at times.
This article is a collection of summaries of strange and unexplained discoveries. There are no theories as to their origins, except for the humor injected into the article.
Despite knowing that there is still much on this Earth that remains unexplained, I found much of this to be surprising.
The Antikythera Mechanism that is mentioned in the article does seem to have partially explained, at least in function. It's existence 2000 years ago hasn't.