Castle Clinton. This never happened, and the columns were instead dumped in a landfill in New Jersey. Castle Clinton was one of the earliest buildings that the New York City Landmarks Preservation Commission (LPC) considered protecting as a New York City landmark. The LPC designated the fort as a city landmark in November 1965, seven months after the commission's founding. Subsequently, Castle Clinton was listed on the National Register of Historic Places on October 15, 1966, the day the National Historic Preservation Act of 1966 went into effect. A restoration of Castle Clinton commenced in August 1968. The work included restoring the exterior and interior walls; adding a shingle roof; removing a moat and other facilities related to the fort's use as an aquarium; and repairing officers' quarters, parade ground, and ammunition storage areas. This renovation was supposed to last one year. The federal government postponed funding for further restoration because of the Vietnam War. The NPS commenced a wider-ranging restoration project circa 1972, which cost about $750,000. As part of this project, the officers' quarters were restored, and an exhibit was placed inside a former powder magazine. Preservationists were advocating for Castle Clinton to be used as a performing-arts center by late 1972. The following June, the fort hosted its first concert since the 1850s, a performance commemorating Jemny Lind. Castle Clinton reopened on May 25, 1975, with a performance of Beethoven's 9th by the American Symphony Orchestra. City and federal officials rededicated the monument the next month. Use as national monument 1970s to 1990s When it reopened, Castle Clinton hosted concerts for the public during summer weekends, and it also hosted exhibits and guided tours. The fort contained dioramas depicting Manhattan at various points in the 19th and 20th centuries. In 1979, the NPS and the Manhattan Cultural Council commissioned four sculptures, which were installed within Castle Clinton's central courtyard. Following a series of thefts and break-ins at Castle Clinton in the early 1980s, the NPS stationed several armed guards outside the fort. In the decade after it was rededicated, the fort was open nine months a year, operating five days per week. NPS officials estimated that the fort had no more than 100,000 annual visitors. The NPS closed Castle Clinton for renovations in December 1985. It announced plans to install two ticket booths and a waiting area for ferries to the Statue of Liberty National Monument. The