What is the rarest object found in the world, which to date does not have a sustainable explanation?

I imagine that there are several candidates, some known, others not so much, and that it will depend on the criteria of each one. But since I found the question very interesting, I did some research. This is what I found:

rat king

The origin of the phenomenon is an intertwining of the tails of the various rats in a nest that, according to legend, would appear when a certain number of rats (or animals with long tails) that live in small enclosures can become intertwined and irremediably tied each other, due to blood or droppings or dry dirt that impregnates the tails forming a knot impossible to undo. The animals thus linked can live and grow together. According to legend, the King of the Rats exercises a certain authority over the other rats, for example, getting them to get him food. Most researchers believe that this phenomenon is legendary or has been created by conscious manipulation by humans, who tie the tails of dead rats and mummify them. The earliest documentary report of the existence of the “rat king” comes from the year 1564, in the eighteenth century the phenomenon ceased to be discussed. There are very few descriptions of the phenomenon already in the 20th century and it is explained that it is partly due to improvements in hygiene in houses.

Roman dodecahedron

About a hundred of these dodecahedrons have been found from Wales to Hungary and Spain and eastern Italy, although most were found in Germany and France. Their size varies between 4 and 11 centimeters, they also vary in terms of textures. Roman dodecahedrons date from the 2nd or 3rd centuries AD. C. Most are made of bronze, but some are made of stone. No mention of these objects has been found in the chronicles or images of the time, so their function is unknown. It is speculated among their possible uses that they were candlesticks (wax was found inside two artifacts); dice; devices to determine the optimum sowing date for winter grain; gauges to gauge water pipes or bases to support the Roman eagle, army standard.

Hear news

It is known by the name of rongorongo to a writing system discovered on Easter Island in the s. XIX, carved primarily with obsidian points, mostly on wooden tablets. There are authors who say that this form of writing is the only structured writing in all of Oceania, although a reliable decipherment is still lacking to prove it. The symbols or glyphs are carved along grooves made in advance of engraving on the artifacts and are between 9 and 14 mm high on average. They seem to graphically represent figurines of anthropomorphic beings in various postures, other fantasy creatures that resemble birds, plants and other terrestrial and aquatic animals, celestial objects, as well as geometric objects, small hooks, among others.

The Ubaid Lizard Men

It is a commonly accepted opinion in mainstream archeology that civilization began in Iraq, in ancient Mesopotamia with the great civilization of Sumer. However, there is an archaeological discovery at the Al Ubaid archaeological site, where many 7,000-year-old pre-Sumerian artifacts were found, depicting humanoid figures with lizard-like features. Male and female figures were found in different postures, and in most of the figures they appeared to be wearing a helmet and had some form of padding on the shoulders. Other figures were found to contain a staff or scepter, possibly as a symbol of justice and decision. Each figure with a different pose, but the strangest of all is that some female figures were holding babies sucking milk, with the child also depicted as a lizard-like creature. The figures have long heads, almond-shaped eyes, long, tapered faces, and a lizard-like nose. Exactly what they represent is completely unknown.

Codex Gigas

The Codex Gigas (Latin: ‘big book’), also known as the Codex Gigas, the Devil’s Codex or the Satan’s Codex, is an ancient medieval parchment manuscript created in the early 13th century and written in Latin presumably by the monk Germán el Inmate of the Podlažice monastery (in Chrudim, center of today’s Czech Republic). It is impressive in size (92 × 50.5 × 22 cm, the largest known medieval manuscript), 624 pages thick, and weighs 75 kg. It is illuminated with red, blue, yellow, green, and gold inks, both in capital letters. capitals as in other pages, in which the thumbnail can occupy the entire page. It is in an excellent state of conservation. The Codex is believed to have been created between 1204-1230, it is estimated that it was written in approximately thirty years by a single person. Nevertheless, a legend arose that counted the writing of the book through a pact with the Devil. The book contains:

  • the Bible (the Vulgate version, except for the Acts of the Apostles and the Apocalypse, which come from an earlier version),
  • el texto completo de la Chronica Bohemorum (Crónica checa) de Cosmas de Praga,
  • medicinal cures,
  • magic enchantments,
  • two works by the Jewish historian Flavius ​​Josephus (the Jewish Antiquities and The Jewish War),
  • the Etymologies of Archbishop Saint Isidore of Seville,
  • various treatises on medicine by the physician Constantine the African,
  • a calendar,
  • an obituary list of deceased persons and other texts.

Such a combination of texts does not exist anywhere else, described by Christopher de Hamel, professor at the University of Cambridge, as “a most peculiar, strange, fascinating, rare and inexplicable object”.