The New Jersey State Museum is located at 205 West State Street in Trenton, New Jersey, United States, overlooking the Delaware River. The Museum is operated as part of the New Jersey Department of State. General admission is free. The Museum's main collection of artifacts and fine art dates back to items collected in the early 19th century. The Museum also includes a 150-seat planetarium and a 380-seat auditorium. The Museum's replica of a Hadrosaurus — a specimen unearthed in Haddonfield in 1858 that was selected as the state's official dinosaur in 1991 — was the target of a renovation project in the late 1990s to correct a display that had been on exhibit since the 1930s. The replica's original skull, a model created as a substitute because the actual skull was not preserved, was to be replaced with the narrower skull of another duck-billed dinosaur.