Limestone City is a nickname for the city of Kingston, located in Ontario, Canada. The nickname is derived from the city's extensive use of limestone in its architecture, which gives the city a distinctive and historic appearance. Kingston is home to a number of historic buildings, including Fort Henry, Kingston City Hall, and Queen's University, that prominently feature limestone construction. Additionally, the city's waterfront area and downtown core are lined with limestone buildings and structures, contributing to its reputation as Limestone City.