Park Service. The Great Hall is long and wide and was originally used as the Patent Search Room for more than three million patents cataloged by the Department of Commerce (the United States Patent and Trademark Office is part of the Commerce Department). As part of the United States Bicentennial celebrations, the Great Hall became the Bicentennial Visitor Center in 1976 and until 1989 housed the Washington Tourist Information Center. Renovations began in July 1993 with the restoration of the ornate plaster ceiling to restore the simple elegance of the Great Hall. The original Indiana limestone walls, bronze doors, Vermont marble base and accent flooring, and Italianate bronze chandeliers were cleaned and refurbished. In March 1995 the White House Visitor Center was opened. Aspects of other buildings built in Federal Triangle in the 1930s are present in the building, including courtyards (natural light and ventilation are provided to inner offices by six interior courtyards and a Neoclassical (Greek Revival) architectural style (a Doric colonnade on three sides). The 15th Street facade stretches almost three city blocks and has four pedimented pavilions featuring pediment sculpture by James Earle Fraser and Haig Patigian. The National Aquarium was located in the basement and was open to the public since the building was completed in 1932 until 2013. Also located inside the building is the Commerce Research Library, a Federal Agency Library which is open to the public but is used mainly by Commerce and other federal government employees and academics. The National Institute of Standards and Technology (NIST), National Oceanic and Atmospheric Administration (NOAA), and Census Bureau, all part of the Department of Commerce, maintain their own library collections. Because the Census Bureau is a part of the Commerce Department, the official Population Clock at one point was located in the lobby of the Hoover Building. It briefly malfunctioned in 1982 when it showed some 50 million more Americans than estimated. The clock now resides at the Census Bureau's headquarters in Suitland, Maryland. National Aquarium in Washington, D.C. The National Aquarium in Washington, D.C. was an aquarium in Washington D.C. It was located in the Herbert C. Hoover Building that was moved to the building at its creation in 1932. It was the first free and public aquarium in the US. It closed on September 30, 2013 after Budget sequestration in 2013, having permanently lost its location due to the renovation of the