The Cinerama Dome is one of the few round movie theatres you will ever see. It was built in 1963 to present special "Cinerama" movies. Cinerama was a wide-screen format of the early 60's, which used three separate 35mm projectors and a vast curved screen to present realistic travelogues. It was a huge success at first, and hundreds of domed theatres were planned, but the wide-screen process proved too expensive, and the Cinerama movie fad soon faded from popularity.
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And it is also one of the most identifiable Hollywood landmarks. It's hard to miss the giant white dome at Sunset & Vine. (It's the only geodesic dome in the world built entirely of concrete - 316 interlocking concrete hexagons.)