It is evolutionally reported that number of infrastructures, in particular, superstructures constructed and currently in services are aged and deteriorated after long-year service. In the case of concrete structures, fatigue damage due to traffic and corrosion-induced cracks are extensively reported. In the case of steel structures, deterioration mostly occurs due to fatigue cracking, resulting from increasing span length and overloading of traffic vehicles. As presented here, AE measurement has been applied to such superstructures as building, reinforced concrete (RC) bridge, and steel bridge. In addition, innovative applications of AE tomography are discussed. Thus, the deterioration and the damage of superstructures are extensively summarized.