been internally inspected to test the "byproduct buildup" theory, during its many years of service. After a smaller leak occurred in January 2007, NDK was warned about safety concerns again, this time by insurance investigators, who were ultimately ignored. Finally, the CSB determined the method for growing crystals used at NDK's Belvidere facility was prohibitively dangerous in the first place, pointing out such methods had been already abandoned by other crystal-growing facilities in favor of safer, lower-pressure and lower temperature processes. Following their own 2010 investigation, the Occupational Safety and Health Administration fined NDK more than half a million dollars for willful disregard for legal requirements, and "unacceptable" indifference to safety and health. The NDK facility was demolished in 2015, with no plans to rebuild. Culture Pettit Memorial Chapel, designed by Frank Lloyd Wright; the Lampert-Wildflower House, and the Belvidere Post Office, designed by James Knox Taylor, are listed on the National Register of Historic Places. Parks include Spencer Park, Belvidere Municipal Park, and the Boone County Fairgrounds. Belvidere is known as the "City of Murals", for its numerous murals. Representation in other media The Left Behind series fictional character Rayford Steele was born here. Services Belvidere used to have two hospitals, St. Joseph Hospital and Highland Hospital. Both closed in the late 20th century, with St. Joseph's closing in 1999. In 2008, SwedishAmerican Hospital opened a new building. In 2009, they renovated and reopened the former Highland Hospital, which now operates the city's only emergency department. Cemeteries include the Belvidere Cemetery (Richard S. Molony's interment site) and St. James Catholic Cemetery. The nearest general aviation airport is Poplar Grove Airport, formerly known as Belvidere Airport. Education Schools include Belvidere High School, Belvidere North High School, Belvidere Endeavor High School, Belvidere South Middle School, Belvidere Central Middle School, Lincoln Elementary School, Perry Elementary School, Meehan Elementary School, Caledonia Elementary School, Seth Whitman Elementary school, and one academy, Washington Academy which are all part of the Belvidere Community Unit School District 100. Belvidere's public library, Ida Public Library, was founded in 1883. The current building, a Carnegie Library, was constructed in 1912 and opened in 1913. An addition was built in 1987. It includes adult and children services, a Local History and Genealogy Room, and Internet/computer access. The Boone County Museum was started in 1936 and holds over 100,000 artifacts. It has interactive displays and a research library, with more than