The "original" park that started the chain is Six Flags Over Texas, which opened in Arlington in August 1961. It was founded by Angus G. Wynne and was the first to use the "Six Flags" name, representing the six sovereign nations that have ruled over Texas throughout history. However, there are two parks currently in the Six Flags portfolio that are actually older in terms of their founding date, though they were acquired by the company later. Six Flags New England (in Agawam, Massachusetts) originally opened as "Gallops Grove" in 1870, making it the oldest physical site in the chain. Similarly, Six Flags Great Escape (in Queensbury, New York) opened in 1954 as Storytown USA. In 2026, while Six Flags Over Texas is celebrated as the "Birthplace" of the theme park brand and its specific "pay-one-price" business model, the site at Six Flags New England holds the title for the longest continuous operation as a recreational destination, having survived for over 150 years through various rebrandings and ownership changes.