Arch of Gallienus (Arco di Gallieno), Rome, Lazio, Italy, Europe

rome lazio italy ancient monument roman architecture historic site travel destination european landmark tourist attraction cultural heritage architecture lovers archaeological site history sightseeing urban exploration ancient history cityscape stone arch ruins tourism outdoor spaces historic district local culture pedestrian area heritage site walking tour architectural beauty classical architecture landmarks vibrant buildings historical significance ancient rome european travel ancient ruins tourist experience urban landscape visiting italy historical architecture preservation open space unique sights exploration arch gallienus arco gallieno