The residential gruup “Núñez Chinchilla” is located north of the great plaza of Copan, an ancient Maya site in western Honduras, Saturday, Sept. 23, 2023. (AP Photo/Moises Castillo) In the quest to build better for the future, some are looking for answers in the long-ago past. Ancient builders across the world created structures that are still standing today, thousands of years later — from Roman engineers who poured thick concrete sea barriers, to Maya masons who crafted plaster sculptures to their gods, to Chinese builders who raised walls against invaders. Yet scores of more recent structures are already staring down…