Glass-blower's place. In a certain movie trilogy, Bilbo's house had hand-rolled glass in the windows, and Saruman's tower had glass windows. The elves drank from glass goblets, and, IIRC, there were glass objects in Elrond's library. The palantiri may have been glass or lead crystal. So, the knowledge of how to make and shape it could be considered widespread among the fantasy races. Glass, itself, is very magical. :) Carolly