'What will our futures linguistic landscape look like when most languages have become extinct?' 'Past and Future Tongues' is a speculative design project that aims to bring awareness to the significance of potentially endangered languages. It acts as a cautionary tale to explain the consequences of what could happen when it is too late to document or preserve them. Presented as a fictional narrative, the project proposes a world in the next few centuries where languages have rapidly disappeared and the 'Museum of Past and Future Tongues' is an archive of the lost languages.