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Sebastopol House Historic Site is an antebellum Greek Revival house built of concrete, located in Seguin, Texas, United States. Joshua W. Young built it between 1854 and 1856 for his sister, Catherine LeGette. Today Sebastopol is one of some 20 surviving buildings that give Seguin the largest concentration of early 19th-century structures in the U.S. As a result of its unusual concrete construction, Sebastopol House was included in the Historic American Buildings Survey (H.A.B.S.) in 1936, made a Registered Texas Historical Landmark in 1964, and then listed on the National Register of Historic Places on August 25, 1970. It is a prime example of the limecrete structures of Seguin. The house is constructed entirely of unreinforced cast-in-place concrete and it is one of the oldest and largest structures in the state using this building method. This process was developed and patented by doctor and chemist John Park, who had moved to Seguin in 1846. But he soon had imitators and competitors, contractors like Joshua Young. Often slaves did the hard physical work, using boards to build forms, kept at the right width (12 to 18 inches) by screws and oak spacers when the limecrete mixture was poured into the forms, and allowed to harden. Then the forms were raised another foot or so and the process repeated. A large part of the "Park's concrete" mix was caliche, a thick deposit of gravelly clay that underlies Seguin.