Roman arch

A Roman arch is a curved structure that spans an opening, such as a doorway or bridge, by distributing weight evenly down its sides. Constructed from wedge-shaped stones called voussoirs, with a central stone called the keystone locking everything in place, the arch channels pressure outward and downward, allowing it to support heavy loads and span wider spaces than straight beams. This innovative design provided stability and strength, enabling the construction of large aqueducts, bridges, and buildings that have stood for centuries. The Roman arch's principles are foundational to modern architecture and engineering.