The Ponte Vecchio (Old Bridge) is one of the touristy places to see in Florence, Italy. As the name says, it is an old bridge, it dates back from the Medieval Period and it crosses the Arno River (Hitler apparently spared it from bombing during the war).
The street leading to it is one jewelry shop after another (Italian gold of course are known to be of good quality), occasionally interspersed with gellateria and shops selling leather goods which are also good buys especially in Florence, vendors selling tacky tourist souvenirs such as aprons with David and Birth of Venus images (all of the above - gold, leather, gelato, tacky aprons) I am guilty of purchasing -- told you it's touristy.
If you are going with your significant other, bring a padlock. In the middle of the bridge is a place where lovers would declare their undying love by locking their padlock and throwing away the key (in the river).