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The Carroll County Courthouse, located in Courthouse Square in Mount Carroll, is the county courthouse of Carroll County, Illinois. The courthouse, which was designed by Chicago architects Olmstead and Nicholson, was built in 1858 and has been used continuously since. During the Civil War, the courthouse also served as a barracks for the county's troops prior to their commissioning. The Lorado Taft Monument, a memorial to the county's Civil War veterans, was added to the site in 1891. According to Ripley's Believe It or Not, the monument is the only Civil War memorial with an annex, which was added to fit names which had been left off the original memorial. The courthouse was added to the National Register of Historic Places on November 26, 1973.

The Nathaniel Halderman House is a historic house located at 728 East Washington Street in Mount Carroll, Illinois. The house was built in 1854 for Nathaniel Halderman, an early settler of Carroll County. Halderman came to the county in 1841; he partnered with other early settlers to plat Mount Carroll and build the town's first mill. He was the city's first mayor and later Carroll County's treasurer. Jacob Emmert, one of Halderman's business partners, built the Italianate house using brick from the city's brickyard. The house's design features an open porch along the front, a cornice with paired brackets, and a cupola atop the roof.The house was added to the National Register of Historic Places on November 24, 1980.

Mount Carroll is a city in and the county seat of Carroll County, Illinois, United States. The population was 1,479 at the 2020 census.

The Mount Carroll Seminary was the name of Shimer College from 1853 to 1896. The Seminary was located in Mount Carroll, Illinois, in the United States. A pioneering institution in its time and place, the Mount Carroll Seminary served as a center of culture and education in 19th-century northwestern Illinois. Despite frequent prognostications of failure, it grew from 11 students in a single room to more than 100 students on a spacious campus with four principal buildings. Unusually for the time, the school was governed entirely by women, most notably the founder Frances Wood Shimer, who was the chief administrator throughout the Seminary's entire existence.

The Campbell Center for Historic Preservation Studies is an American museum studies school located in Mount Carroll, Illinois. In 1979, the Center purchased the campus of Shimer College, which had occupied the site from 1853 until moving cross-state to Waukegan. The campus was placed on the National Register of Historic Places in 1980. Classes began that summer. The Center primarily offers summer-semester continuing education in the areas of historic preservation, conservation, and collections care. In 2005, the Center initiated a certificate program in preventive care of artifacts. The instructors are experienced professionals drawn from institutions and companies around the world, and students come from several countries as well. On November 2, 2012, ground was broken for the Frances Wood Shimer Memorial Arboretum, named after Shimer College founder and first president Frances Shimer, who planted thousands of trees around the campus. The formal dedication of the arboretum was set for June 2013.

The Mount Carroll Historic District is a designated historic district in the Carroll County, Illinois town of Mount Carroll, which is the county seat. The district is listed on the National Register of Historic Places (NRHP), and is one of a total six sites in the county included on the Register. The district was added to the NRHP in 1980. One building within the district, the Carroll County Courthouse, had already been added to the NRHP in 1973.The District is divided into three major sections: the traditional downtown of Mount Carroll, including the courthouse, library and business district; a residential area to the south of the downtown; and further south, the historic original campus of Chicago's Shimer College, now occupied by the Campbell Center for Historic Preservation Studies. The great majority of the buildings in the first two sections date from before 1900. Due to a fire that destroyed the original Mount Carroll Seminary campus in 1906, all of the Shimer campus buildings are from the 20th century, but most date from before 1930.NRHP-listed structures that are located within Mount Carroll but not included in the district are the Caroline Mark House and Nathaniel Halderman House.

Ashdale Junction is a former Chicago, Milwaukee, St. Paul and Pacific Railroad station and junction in Carroll County, Illinois, United States. Ashdale Junction is located along the Milwaukee Road railroad line east of Mount Carroll. Ashdale Junction marks the former site of the junction between the main line of the Milwaukee Road and the "Ashdale cutoff," which allowed some trains to bypass the yard and steep grade at Savanna, rejoining the main line at Ebner. The 15-mile cutoff, running along Johnson Creek, was built by the "Ashdale and Thomson Railroad" (a subsidiary of the Milwaukee Road) in 1902, and began carrying trains such as the Southwest Limited in 1903.: 43  It was part of a larger bypass project running across Iowa, called the "Kansas City Cutoff.": 161  The Ashdale cutoff was abandoned in 1952.There was no terminal at Ashdale, but passenger trains stopped there at least as late as 1912; it was the only stop between Lanark and Mount Carroll.

The Timber Lake Playhouse, founded in 1961, is the oldest continuously operating professional and resident summer stock theatre company in Illinois.The playhouse stands in rural Mount Carroll Township, Carroll County, Illinois, a short distance southeast of the town of Mount Carroll. It is located on the Timber Lake reservoir, on the east branch of Johnson Creek, near the Timber Lake resort. The playhouse is adjacent to the Timber Lake Campground and Resort. The current theatre structure was built and opened in June 1975, following a fire that destroyed the initial facility the previous year. The theatre is now outfitted with 371 fixed seats overlooking a 45-foot semi-thrust revolving stage. An additional 18 buildings on the ground serve various residence and preparation functions, including scene and costume shops and a large rehearsal pavilion.Beginning in 2018, Timber Lake Playhouse operates under a Category X agreement with Actors Equity Association (AEA).

Mount Carroll Township is one of twelve townships in Carroll County, Illinois, USA. As of the 2020 census, its population was 1,963 and it contained 1,063 housing units.

Salem Township is one of twelve townships in Carroll County, Illinois, USA. As of the 2020 census, its population was 350 and it contained 155 housing units.

Carroll County is a county located in the U.S. state of Illinois. As of the 2020 census, the population was 15,702. Its county seat is Mount Carroll.

Daggett is a former settlement in Carroll County, Illinois, United States. Daggett was located in Salem Township, south of Mount Carroll along Illinois Route 78.