Round Rockbr/Williamson County, Texasbr/30 30.662' N 97 40.232' W br/808 E. Main Avenue. br/br/Text: Swedish immigrant Johanna Olson (1835-1914) purchased this property in 1907 after she returned to the Round Rock area upon the death of her husband, Johannes, in 1894. Local contractor A.S. Robertson built this house for her in 1908, and it remained in the Olson family until 1944. Johanna and her daughters took in boarders from nearby Trinity College during its existence from 1906 until 1929. A good local example of Queen Anne architecture, the Olson House features classic elements of that style, including its asymmetry, wrap-around porch and fishscale shingles.