One of the most important additions that the Romans brought to architecture is the arch, which was originally borrowed from the Etruscans. Using concrete, bricks, and the concept of the arch, Rome was able to provide many of its citizens with water. Aqueducts (water bridges) were built throughout Rome, their arch structures bringing water to areas far away from natural water supplies.
The arch quickly led to the dome ceilings used in many houses and buildings. Because arched and domed structures can share weight evenly, the concept was soon being used throughout the city and around the world.