What is the second largest triumphal arch in the world?

The second largest triumphal arch in the world is the Arch of Constantine, located in Rome, Italy. Completed in AD 315, it commemorates Emperor Constantine's victory at the Battle of Milvian Bridge. The arch stands approximately 21 meters high and 25 meters wide, featuring intricate reliefs and inscriptions that celebrate his achievements. It is a significant symbol of ancient Roman architecture and history.