A barrel vault is an architectural structure formed by extending a simple arch along a given distance. This design creates a continuous series of arches that resemble a tunnel, providing a strong and stable ceiling. Barrel vaults are often used in large spaces, such as cathedrals and ancient Roman buildings, where they can support significant weight. The construction of barrel vaults allows for the efficient distribution of weight, making them ideal for creating expansive interiors. They can be made from various materials, including stone, brick, or concrete, and are often adorned with decorative elements to enhance their aesthetic appeal.