The original Six Flags theme park, Six Flags Over Texas, officially opened on August 5, 1961. Themed around the six flags that had flown over Texas, the park's original concept featured first-of-its-kind attractions, heavily-themed areas and a major focus on entertainment and guest experience. Six Flags Over Texas saw tremendous growth in the 1960s. Marquee attractions, such as the El Aserradero log flume, the Runaway Mine Train roller coaster and hundreds of thousands of dollars invested into entertainment, highlighted the decade.