Landmarks Illinois is a nonprofit organization dedicated to preserving and promoting the architectural heritage of the state of Illinois. Founded in 1971, it focuses on protecting historic buildings and sites through advocacy, education, and community engagement. The organization works to raise awareness about the importance of preserving Illinois' unique architectural history. The organization also offers various programs and resources, including grants and technical assistance, to support preservation efforts. Landmarks Illinois collaborates with local communities, government agencies, and other organizations to ensure that significant landmarks, such as Frank Lloyd Wright designs and Chicago's historic neighborhoods, are maintained for future generations.