Language is a vehicle of intangible heritage and transmits many social and cultural concepts from generation to generation. Half of the world's languages, including most of the Altaic languages, are now in danger of extinction. The loss of a language means the loss of cultural and intellectual diversity. This paper describes a linguistic project which aims to preserve the endangered Altaic languages. The ASK REAL (Altaic Society of Korea, Researches on Endangered Altaic Languages) team has gathered linguistic resources from thirty-eight Altaic languages and plans to build an extensive digital archive of all fifty-five of them. Through field research in minority language communities spread over a vast area of Eurasia, we acquired nearly three thousand lexical items of multimedia data, a few hundred grammatical constructions and another few hundred examples of daily conversation for each language. The data is converted into a standard digital format and managed in a data base. A small part of the collection is currently available to the public via an easily accessible web interface with multilingual annotations for international users.