I never knew about the Marriott park planned for Washington, DC, but Marriott was also looking at property near Columbia, Maryland for a park in the mid 1970's. They faced a battle there also and lost when Howard County passed a resolution that there could only be one amusement park located within Howard County. At that time there was a childrens "amusement" park called Enchanted Forest located in Ellicott City. Over the last 30 years or so Six Flags and Disney have also failed at attempts to build theme parks In Maryland. SF had their eyes on two sites in eastern Baltimore County for parks, one of them that had been an amusment park up until about 1947. Both Disney and SF had expressed interest in building a park at the former US Naval Training Base in Cecil Co, right off I-95. Maryland's problem is that anytime a major theme park is proposed, everyone starts to suffer from "Not In My Back Yard" syndrome. I'm really suprised the park that is today SFA has survived.