June 6, 1933: The first drive-in movie theater opens
Richard Hollingshead received a patent for the concept of a "Park-In" theater (as they were originally called) in May of 1933, and opened his first theater for motorists in Camden, New Jersey the following month.
His patent was overturned in 1949 and drive-ins began opening all over the country. They were known for mostly showing 'B' movies and the sound quality wasn't very good until technology allowed for the movie's soundtrack to be played over a car's FM radio.
Drive-ins became a weekend destination for Americans during the 1950s and 60s. At their peak, about 5000 drive-ins were scattered across America. Now with the rise of home video systems and comfortable walk-in theaters, the total number of drive-ins has fallen to fewer than 500.