Arch structures are architectural forms that use a curved shape to support weight. They are commonly made from materials like stone, brick, or concrete. The design allows for the distribution of forces, making them strong and stable. Arch structures can be found in bridges, doorways, and aqueducts, showcasing their versatility in construction. One of the most famous examples of arch structures is the Roman Arch, which has influenced many modern designs. The use of arches dates back thousands of years, with significant contributions from ancient civilizations such as the Romans and Greeks. Their enduring strength and aesthetic appeal continue to inspire architects today.