The versatility of concrete allows architects and engineers to be innovative in their home designs. While concrete has been around as a building material since the Romans built the Colosseum, technology has improved its durability and applications, making concrete a popular option for building 21st-century homes. Concrete construction provides a number of advantages over wood-frame, including energy efficiency, noise reduction, and fire and wind resistance. Concrete building materials range from traditional blocks and precast panels to concrete that is cast on-site. Although the initial cost of building a concrete house is marginally higher than wood-frame construction, the long-term energy savings can make building with concrete a prudent choice.