Lagrangian points have often be used in science fiction. Space station acheron is located on one of them. But rarely do we hear of the fifth lagrangian, that will be used to monitor our sun… See the video below for more information.
This is important as becoming a space faring civilisation will require us to look at things from other directions …
http://www.esa.int/ESA_Multimedia/Videos/2020/02/Lagrange_mission_to_provide_solar_warning