One of the famous old bridges in Italy is Ponte Vecchio in Florence, built during the Roman times. Aside from its historical fame, it's also a subject of a local legend about two persons who promised to love each other eternally.
Because of this legend, thousands of padlocks had to be removed from its railings every year. Lovers would go to that bridge, secure the padlock on the rail while pronouncing their vow to love each other till the end of time, and then throw the key into the river.
A legend such as this can actually be witnessed in other parts of the world. In my birthplace, for example, we had this bridge we crossed several times a day. It has become a reminder of our good old days and a symbol of our dreams. I used to paint it with lovers sitting at its edges, and a full moon above it.
Bridge is the most useful and romantic human structure. It connects places and people. It reminds us that life is about coming and going. Like love, a bridge brings us to different places and allows us to go back to the ones we love.