Old Cahokia Courthouse

Cahokia was a village in St. Clair County, Illinois, United States. It was located east of the Mississippi River in the Greater St. Louis metropolitan area. As of the 2010 census, 15,241 people lived in the village, a decline from 16,391 in 2000. On May 6, 2021, the village ceased to exist, being incorporated into the new city of Cahokia Heights.The name refers to one of the clans of the historic Illini confederacy, who met early French explorers to the region. Early European settlers named the nearby (and long-abandoned) Cahokia Mounds in present-day Madison County after the Illini clan. But the UNESCO World Heritage Site and State Historic Park was developed by the Mississippian culture, active here from AD 900 to AD 1500. They created an extensive urban complex, the largest of the farflung Mississippian culture territory through the Mississippi and Ohio river valleys. French Canadian colonists founded Cahokia village in 1696 as a Catholic mission. The historic Church of the Holy Family is the oldest continually active Catholic parish in the United States, as well as the oldest church west of the Allegheny Mountains. Other significant colonial and Federal-period buildings listed on the National Register of Historic Places include the Cahokia Courthouse (c. 1740, in the French Colonial style); and the Jarrot Mansion (c. 1810).

The Church of the Holy Family (French: Église de la Sainte-Famille) is a Roman Catholic church located at 116 Church Street in the St. Clair County, Illinois city of Cahokia Heights. Built beginning in 1786, it is a remarkably unaltered example of the French colonial construction style known as "poteaux-sur-solle" (post-on-sill), and one of the few such buildings surviving in North America. It was declared a National Historic Landmark and added to the National Register of Historic Places in 1970. The occupying congregation is the oldest continuously active Catholic Parish in the United States, having been founded in 1699 by Canadian missionaries, and the oldest church west of the Allegheny Mountains. At the invitation of Bishop Edward Braxton, the Institute of Christ the King Sovereign Priest continues to offer Mass in this historic church according to the Missal of 1962. Visitors are also welcome for guided tours in the summer. In celebration of the 2018 Illinois Bicentennial, Holy Family Church was selected as one of the Illinois 200 Great Places by the American Institute of Architects Illinois component (AIA Illinois).

The Nicholas Jarrot Mansion is a historic house at 124 East First Street in Cahokia Heights, Illinois and is operated as an inactive historic site by the Illinois Historic Preservation Agency (IHPA). It is a State Historic Site, is listed on the National Register of Historic Places, and became a National Historic Landmark in 2001. Built in 1807–1810 for the son of French colonists, it is an extremely rare example of Federal architecture in the upper Mississippi River valley.

Cahokia Heights is a city in St. Clair County, Illinois, United States. It was founded on May 6, 2021, by the merger of the villages of Cahokia and Alorton and the city of Centreville. On May 6, 2021, Curtis McCall Sr. was sworn in as the city's first mayor, having run unopposed.

North Dupo is an unincorporated community in Sugarloaf Township, St. Clair County, Illinois, United States. North Dupo is located along Illinois Route 3 south of Cahokia and north of Dupo, bordering both villages. The Pierre Martin House, which is listed on the National Register of Historic Places, is located in North Dupo.

The Pierre Martin House (or Martin–Boismenue House) is a single-family French Colonial House and historic site in East Carondelet, Illinois about 1.5 miles (2.4 km) East of the Mississippi River. The house, built circa 1790, is owned by the Illinois Historic Preservation Agency. and located at the intersection of First Street and Old Route 3 in North Dupo.

The St. Louis Arsenal is a large complex of federal military weapons and ammunition storage buildings operated by the United States Air Force in St. Louis, Missouri. During the American Civil War, the St. Louis arsenal's contents were transferred to Illinois by Union Captain Nathaniel Lyon, an act that helped fuel tension between secessionists and those citizens loyal to the Federal government.

Cahokia High School is a public high school in Cahokia Heights, Illinois, United States that is part of the Cahokia Unit School District 187.

The Greater Saint Louis Air & Space Museum is a museum with the mission to preserve and display historic air and space craft and artifacts, and provide educational programs.

Sauget ( saw-ZHAY) is a village in St. Clair County, Illinois, United States. It is part of Greater St. Louis. The population was 141 at the 2020 census, down from 159 in 2010.

The Lemp Brewery was a beer brewing company established in 1840 in St. Louis, Missouri that was acquired by the Griesedieck Beverage Company in 1920, which subsequently became the Falstaff Brewing Corporation. The brewery complex property consists of 27 buildings on a 13.7-acre (0.055 km2) site in the Marine Villa neighborhood. St. Louisian Steve DeBellis has been the owner of the Lemp Brewing Company trademark since 1988.

The Lemp Mansion (3322 DeMenil Place, St. Louis, Missouri) is a historical house in Benton Park, St. Louis, Missouri. It is also the site of three suicides by Lemp family members after the death of the son Frederick Lemp, whose William J. Lemp Brewing Co. dominated the St. Louis beer market before Prohibition with its Falstaff beer brand. The mansion is said to be haunted by members of the Lemp family.