The roman engineering achievement that made large public structures possible was

Roman Concrete. Roman Concrete (also called opus caementicium) was one of the most important engineering achievements from the Roman Empire. It was a material based on hydraulic-setting cement, which is what some modern cements (like Portland cement) are based on. There are still some differences that make this concrete special, mainly the fact that they incorporated volcanic ash to prevent cracks from spreading.

me on my last question.

martin luther believed that selling indulgences was wrong and gave people a license to sin. the roman catholic church used the practice of indulgences to raise money for major building projects.