Blanche, D.H. Holmes, Godchaux's, Gus Mayer, Labiche's, Kreeger's, and Krauss anchored numerous well-known specialty retailers, such as Rubenstein Bros., Adler's Jewelry, Koslow's, Rapp's, and Werlein's Music. National retailers, like Kress, Woolworth, and Walgreens were present alongside local drugstore K&B. Sears operated a large store one block off Canal, on Baronne Street. Bookstores, theaters, and movie palaces also abounded, with the neon marquees of the Saenger, Loews State, RKO Orpheum, Joy, and Civic theaters nightly casting multi-colored lights onto surrounding sidewalks. In the 1950s, six-lane Loyola Avenue was constructed as an extension of Elk Place, cutting a swath through a low-income residential district and initially hosting the city's new civic center complex. The late-1960s widening of Poydras Street was undertaken to create another six-lane central area circulator for vehicular traffic, as well as to accommodate modern high-rise construction. The City of New Orleans partook in transforming the district from 1973 to 1993, in a collaboration between public and private sectors to spark active community participation. The portion of the CBD closer to the Mississippi River and upriver from Poydras Street is known as the Warehouse District, because it was heavily devoted to warehousing and manufacturing before shipping became containerized. The 1984 World's Fair drew attention to the then semi-derelict district, resulting in steady investment and redevelopment from the mid-1980s onward. Many of the old 19th-century warehouses have been converted into hotels, restaurants, condominiums, and art galleries. Notable structures in the CBD include the Greek Revival Gallier Hall (the city's former city hall); Caesars Superdome; the Smoothie King Center; the city's present-day, International style city hall; and Hancock Whitney Center, the city's tallest building and headquarters for Royal Dutch Shell's Gulf of Mexico Exploration and Production. Other significant attractions include the postmodern Piazza d'Italia, Harrah's Casino, the World Trade Center New Orleans, the U.S. Fifth Circuit Court of Appeals, St. Patrick's Church, the Hibernia Bank Building, and the former New Orleans Cotton Exchange. The principal public park in the CBD is Lafayette Square, upon which face both Gallier Hall and the Fifth Circuit Court of Appeals. Other public spaces include Duncan Plaza, Elk Place, the Piazza d'Italia, Lee Circle, Mississippi River Heritage Park, Spanish Plaza, and the Richard and Annette Bloch Cancer Survivors Plaza. Museums include the National World War II Museum, the Ogden Museum of Southern Art, the Louisiana Children's Museum, the New Orleans Contemporary Arts Center and Confederate Memorial Hall