20th century By the end of the century, the population grew to approximately 400 and in 1911, the City of Winter Haven was incorporated. The Chain of Lakes canals were begun in 1915. The first Florida boom took place in the 1920s as towns sprang up all over the peninsula. Florida's potential as a place to live and a place to visit was first realized in the 1920s, but the Great Depression slowed growth until after World War II. Winter Haven Hospital was founded in 1926 and has been in the city ever since. During this period, the population of Winter Haven began to grow substantially. Many beautiful single-family homes were built in Winter Haven at this time in the colonial revival style. Over 50 these homes are on the National Register of Historic Places today. They are noted for their architectural style and grace. Most of these historic homes are located in the Interlaken neighborhood. There are four historic districts in Winter Haven. They are Interlaken, Pope Avenue, Winter Haven Heights, and the downtown area. Growth and development In 1930, George W. Jenkins opened the first Publix supermarket in Winter Haven. His second store and the first stand-alone Publix store, was a 27 ft by 65 ft building at 199 West Central Avenue, opened in 1935, which exists today as the Regenerations thrift store. During the 1930s and 1940s, citrus magnate, John A. Snively operated one of the largest fruit packing plants in the world in Winter Haven. Another defining event in Winter Haven was the opening of Cypress Gardens in 1936 by Dick Pope Sr. and his wife, Julie Pope. They first got the idea for the park from a Good Housekeeping magazine that they were reading. By the 1950s, Cypress Gardens was nationally famous. It featured a beautiful botanical garden, water skiing shows, and a staff of southern belles. Many famous celebrities of that time visited the park, including Elvis Presley, Frank Sinatra, Betty Grable, and King Hussein of Jordan. In the 1980s, the Anheuser-Busch corporation purchased the park. They continued to operate the park until 1995. After that, the park struggled, finally closing for good in 2009. On January 21, 2010, the site of Cypress Gardens was formally announced as the selected location for the Legoland Florida theme park, which opened on October 15, 2011. Legoland Florida has successfully retained some of the tradition and history