Bienville Square is a historic city park in the center of downtown Mobile. It was named for Mobile's founder, Jean-Baptiste Le Moyne, Sieur de Bienville. It takes up the entire block bordered by the streets of Dauphin, Saint Joseph, Saint Francis, and North Conception.
Bienville Square had its beginnings as a public park in 1824 when the US Congress passed an act that transferred a large plot of land to the city of Mobile and specified that the property be forever used as a city park. This plot had been the site of the old Spanish Hospital
The square was a primary gathering place for residents of the city from the 1850s to the 1940s. By the late 1960s, however, Bienville Square had become rundown as the city lost population to the suburbs in the postwar housing developments. With the revival of downtown starting in the 1980s, the city renewed the square and its popularity increased.
You're looking for a small magnetic tube, attached to the metal railing