Courthouse tours: 3rd Appellate Court Building and Washington Park
- Address: 1004 Columbus, Ottawa
- Entrance: Front of the building
- Year built: 1860
- Cost: $230,000 (wings added in 1877)
- Counties served (21): Bureau, Fulton, Grundy, Hancock, Henderson, Henry, Iroquois, Kankakee, Knox, LaSalle, Marshall, McDonough, Mercer, Putnam, Peoria, Putnam, Rock Island, Stark, Tazewell, Whiteside, Will
- Historic: Part of the Washington Park Historic District that includes Washington Park, site of the 1st Lincoln-Douglas debate on Aug. 21, 1858 - 151 years ago today.
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