historictheatres.org

XEWor TIL, the name Nickelodeon is derived from an old chain of movie theatres in the United States, having over 8,000 theatres at one point. The name itself comes from the terms: Nickel for 5 cents, and the greek word Odeon, meaning a building for Musical Performances.
Br7Ve TIL that theatres were among the first air-conditioned spaces available to the public, partly why theatre was and is still so popular today.