During the 1890s, when movies were new, there was no such thing as a movie theater. Films were usually shown between acts at live stage shows.
But then an enterprising man in Pittsburgh, Pennsylvania, took over an empty store, put in 92 seats, a screen, and a piano, and opened the first real movie theater in America.
It was called the nickelodeon, since it cost only a nickel to enter, while odeon means “theater” in Greek. The first movie shown there was The Great Train Robbery.