The Celtic languages
The Celtic languages - Breton, Irish, Gaelic (Scottish), Welsh, - there is no time sounding across all Europe (from Iberian peninsula to Carpathians and from British isles to Asia Minor), - now die away. Descendants of ancient Celts, perfect soldiers and handicraftsmen, artists and the poets who have kept traces of magnificent culture, were now saved basically on northwest suburb of Europe (by the way, a word Britain goes back to the name of britons - one of the Celtic tribes). Almost all modern Celts are bilingual; Bretons speak on a native language and in French, and carriers of the Celtic languages on British isles except the native know English.
To Linguists the most ancient written monuments of the Celtic speech which allow to speak at least about five dead are known (i.e. Disappeared) the Celtic languages (in particular, Gallic in territory of France, Celtiberian in the northeast of modern Spain and Cornish in Great Britain).
The Armenian language
The Isolated place in an Indo-European family takes the Armenian language which carriers live not only in Armenia, but also in Iran, Syria, Lebanon and other countries. Its original writing has arisen in the beginning of V century the Drevnearmjansky literary language known more of one and a half millenia, till now is saved as cult. Under strong influence of the next not Indo-European classic languages the phonetics, grammatical system and lexicon of the Armenian language were considerably changed. However its data essentially helps scientists to solve some important problems.
The Albanian language
To the lonely languages making in borders of an Indo-European family independent groups, the Albanian concerns. Scientists assume that language of Albanians is a successor of the Illyrian language in the ancient time sounding on the Balkans. However in structure of the Albanian language the lines which are pulling together it with more northern neighbours, in particular are traced by Baltic and slavic languages also.