One of the unsolved mysterious that can't be explain by sciences is Out-of-place artifact (OOPArt).
Out-of-place artifact (OOPArt) is a term coined by American naturalist and cryptozoologist Ivan T. Sanderson for an object of historical, archaeological, or paleontological interest found in a very unusual or seemingly impossible context that could challenge conventional historical chronology.
An out-of-place artefact is an object that exists in a place in which it is impossible for it to exist. OOPArts are often of interest to creationists and others who seek evidence that may refute the theory of evolution; they are also used to support religious descriptions of pre-history, ancient astronaut theories, or the notion of vanished civilizations that possessed knowledge or technology more advanced than our own.
Here are few famous OOPArt:
1. Dendera Light
The Dendera light comprises three stone reliefs (one single and a double representation) in the Hathor temple at the Dendera Temple complex located in Egypt. The images are interpreted by traditional Egyptologists to depicting lotus flowers spawning a snake, representing aspects of Egyptian mythology. Controversy arose when the main object in the images was interpreted by some as electric lamps based on comparison to modern devices. These individuals believe the object may be electric lamps. Engineers have constructed a working model based on the reliefs and some authors (such as Peter Krassa and Reinhard Habeck) have produced a basic theory of the device’s operation.
2. Antikythera Mechanism
The Antikythera Mechanism is believed to be an ancient mechanical calculator (also described as a “mechanical computer”) designed to calculate astronomical positions. It was discovered in the Antikythera wreck off the Greek island of Antikythera, between Kythera and Crete, and has been dated to about 150-100 BC. It is especially notable for being a technological artifact with no known predecessor or successor; other machines using technology of such complexity would not appear until the 18th century. While a century of research is finally answering the question of what the mechanism did, we are actually no nearer to answering the question what it was for.
3. Baghdad Battery
The Baghdad Battery was discovered in the village of Khuyut Rabbou’a (near Baghdad, Iraq) in 1936. These artifacts came to wider attention in 1938, when Wilhelm König, the German director of the National Museum of Iraq, found the objects in the museum’s collections, and in 1940 (having returned to Berlin due to illness) published a paper speculating that they may have been galvanic cells, perhaps used for electroplating gold onto silver objects. The artifacts consist of ~130mm (~5 inch) tall terracotta jars (with a one and a half inch mouth) containing a copper cylinder made of a rolled-up copper sheet, which houses a single iron rod. At the top, the iron rod is isolated from the copper by asphalt plugs or stoppers, and both rod and cylinder fit snugly inside the opening of the jar which bulges outward towards the middle (reverse hourglass shape). On MythBusters’ 29th episode (which aired on March 23, 2005), the Baghdad battery myth was put to the test. Ten hand-made terracotta jars were fitted to act as batteries. Lemon juice was chosen as the electrolyte to activate the electrochemical reaction between the copper and iron. (Oddly enough, it was discovered that a single lemon produced more voltage than one of the batteries). When all of the batteries were linked together in series, they produced upwards of 4 volts. Then, the major question was, “What were these ancient batteries used for?”
4. Crystal Skull
The crystal skulls are a number of human skull hardstone carvings made of clear or milky quartz rock, known in art history as "rock crystal", claimed to be pre-Columbian Mesoamerican artifacts by their alleged finders. However, none of the specimens made available for scientific study have been authenticated as pre-Columbian in origin. The results of these studies demonstrated that those examined were manufactured in the mid-19th century or later, almost certainly in Europe.
5. Nazca Lines
The Nazca Lines a series of geoglyphs located in the Nazca Desert, a high arid plateau that stretches 53 miles or more than 80 kilometers between the towns of Nazca and Palpa on the Pampas de Jumana in Peru. They were created by the Nazca culture between 200 BC and 700 AD. There are hundreds of individual figures, ranging in complexity from simple lines to stylized hummingbirds, spiders, monkeys, and lizards. The Nazca lines cannot be recognized as coherent figures except from the air. Since it is presumed the Nazca people could never have seen their work from this vantage point, there has been much speculation on the builders' abilities and motivations.
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