Walter Knott and his cousin, Jim Preston, rented land south of Buena Park and started growing berries there in 1920. They soon opened a berry stand and then a nursery to sell berry plants. The before-and-after photos above show the original berry stand around 1926 and that exact same location as it appears today.
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After a while, Jim left to run his own farm in Norwalk. Then Cordelia Knott added a tea room, which eventually grew into the popular Knott's Chicken Dinner Restaurant (which turned 75 this year). Their daughter, Virginia, opened a small gift shop which grew into a large one. Walter started adding attractions to occupy visitors while they waited for a table at the restaurant. Eventually, this string of small attractions led to a larger one -- A replica of a Ghost Town, which opened to the public in 1941.
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One of the earliest attractions in Ghost Town was the Wagon Train Show, in the Gold Trails Hotel, which appears in the before-and-after photos below. The older photo shows the hotel (new construction, incorporating a few pieces of buildings in actual ghost towns) in the 1940s. The "after" photo shows the recently rebuilt hotel as it appears today.
I won't give you a blow-by-blow account of all the ways Knott's Berry Farm prospered and grew. It's a pretty well known story. Suffice it to say, it was very, very successful, owing in large part to the hard work of the Knott family themselves. The photos below show a later addition to Ghost Town: The Calico Saloon. The first image shows it when it was new, around 1952, and the second image shows it as it appears today.