Jacob Mikanowski writing at Cabinet magazine
Of all the literatures in the world, the smallest and most enigmatic belongs without question to the people of Easter Island. It is written in a script—rongorongo—that no one can decipher. Experts cannot even agree whether it is an alphabet, a syllabary, a mnemonic, or a rebus. Its entire corpus consists of two dozen texts. The longest, consisting of a few thousand signs, winds its way around a magnificent ceremonial staff. The shortest texts—if they can even be called that—consist of barely more than a single sign. One took the form of a tattoo on a man’s back. Another was carved onto a human skull.
For more on old languages, see also The strange reinvention of Icelandic:
The result is something close to unique—a language that is at the same time modern (it can happily express concepts such as podcasting), pure (it borrows very few words from any other tongue) and ancient (it is far closer to the ancestral Norse tongue than its increasingly distant cousins, Danish and Norwegian). Its complex grammar has barely changed in almost a thousand years and has a distinct old-worldliness. But if, like the forniskúfur, Icelandic is a living fossil, it is a lovely and lively one.
And Old and new Finnish grammar:
Surveying the structure of the language as a whole, I end up thinking of it as the concentric rings of a tree, each ring defined by clear patterns in groups of words and phrases, each belying a particular history. The core of the tree is an ancient Paleo-European language, perhaps 6000 BCE or more, followed by a ring of Finnic language from 1500-1000 BC. Then, moving outwards, a ring of Old Norse for a few hundred years either side of the 8th century, leading into the language of trade and nobility, under the Swedish empire, from around 13th century onwards. This administrative language develops further in the 16th century (Helsinki was established in 1550), before the Russian rule, and the language of municipalities, during the 19th century. Finally, the outer rings of the 20th century, and its language of Fordism, modernity and nationalism, becoming the 21st century language of postmodern globalisation.