Benjamin F. Allen, known as Iowa's first millionaire, saw his 18,000 square foot home completed in 1869. Once dubbed the Palace of the Prairie, the Victorian mansion was built on a hillcrest, providing a great view of today's Des Moines skyline. Designed by architect William W. Boyington, the home was built on 30 acres on the outskirts of Des Moines, a city of 7000 people. When Allen ran into financial troubles, the house was sold to Frederick Marion Hubbell, a Des Moines real estate, railroad, and insurance tycoon. Over time the city grew up around Terrace Hill, and the mansion is now located in the heart of Iowa's capitol city.
   The Terrace Hill Mansion, built in the Second Empire architectural style, belongs to the State of Iowa today and has housed some of the state's governors and their families. The mansion has been available for tours since 1978, and has welcomed visitors from all around the world. Terrace Hill, located at 2300 Grand Avenue, covers an eight acre city block and is complete with artwork and period antiques. The carriage house serves as a visitors center and gift shop, and features historic displays.

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