Which ancient civilization is credited with pioneering the widespread use of concrete as a building material, enabling the construction of monumental structures like the Pantheon and the Colosseum?

💡 Explanation:

The Ancient Romans revolutionized architecture by extensively developing and utilizing concrete (opus caementicium) as a primary building material. This innovation allowed them to create complex, durable, and vast structures, many of which stand to this day, including the Pantheon and the Colosseum.