The Sebastopol House State Historic Site, located in Seguin, Texas, is a an 1856 Greek Revival-style house sitting on 2.2 acres of its original 4-acre site. Sebastopol House is listed as a Registered Texas Historic Landmark and is in the National Register of Historic Places as a result of its unusual limecrete construction and its architectural style. The Texas Parks and Wildlife Department acquired the park by purchase in 1976 from the Seguin Conservation Society and opened it to the public in September 1989 following restoration.
Sebastopol, is an unusual split-level, T-shaped residence made of limecrete (a form of concrete), and detailed with Greek Revival-style. Built by Col. Joshua W. Young between 1854 and 1856, it is architecturally and technologically significant as one of the best surviving examples of early concrete construction in the southwest. Limecrete could be made inexpensively from local materials.
Joseph Zorn, Jr. acquired the house in 1874 for his young family. Zorn family members continued to live in the house until 1952. Following Calvert Zorn's death, the house was rented for a time by a local family. By the early 1960s, the house was abandoned and scheduled for demolition. The Seguin Conservation Society bought the property and restored the facade of the house. When it became apparent that major structural repairs were beyond the scope of the Society, the Texas Parks and Wildlife Department stepped in to preserve the landmark.