The Pantheon, which replaced in concrete what had been a mostly wood structure built by Marcus Agrippa (burned in the Nero fire; the current structure is still Roman in date, and the original dedication was put on it), remains a marvel of construction, and figuring out how they’d done it only happened in the past few years. And there are the aqueducts, some of which continued to run for centuries without preventive maintenance. And a water-carrying tunnel system (over 70 miles long) in the Holy Land. And their system of roads...
Their artillery (which on the low end includes slings and javelins, but also includes catapaults of various kinds) enabled the Romans to reduce the Gaulic oppida hillforts, and during an early phase of the conquest of Britain, the British hillforts. Vespasian specialized in it, and served in Britain and Judea before he became Emperor. It was shock and awe in the ancient world.
Some more recent old dead white guys were extremely inventive.
The brain dead leftist of today still hate them, because they are unable to match their building skills. Leftist never build anything, only know how to destroy.
Creativity is a gift. Yes, skills and knowledge can be taught, but wisdom and creativity is not as easily transmitted.