Second Empire homes are instantly recognizable thanks to their iconic mansard roofs, a symbol of the mid-19th century French architectural style that later spread across the United States. These grand, often symmetrical houses are prized today for their historic charm, craftsmanship and enduring curb appeal. The distinctive roof covers the home’s top — often third — story. You might see a house that looks two stories tall, Peter Barr, a professor of art history at Adrian College who documents th