Located in one of the flattest places on the face of this planet are the unexplained Sailing Stones of Racetrack Playa, Death Valley, California. The rocks move leaving clearly visible tracks behind them.
The Codex Gigas. The largest medieval manuscript in existence. Written by a single scribe in the century. Sometimes called The Devil's Bible because of the large, unexplained picture of Satan in the middle of the book.
Vogelherd Cave, Vogelherdhöhlen - Year-Old Mammoth Figurine -- Length: 37 mm; Weight: grams -- Carved from mammoth ivory, this figurine is one of the oldest know pieces of individual artwork in the archaeological record.