Sioux_City_Central_High_School_and_Central_Annex
Sioux City Central High School and Central Annex
United States historic place
The Sioux City Central High School and Central Annex, also known as the Castle on the Hill, are historic buildings located in Sioux City, Iowa, United States. The high school building was listed on the National Register of Historic Places in 1974.[1] The annex was added to the historic designation in 2016.[2]