I fell in love as soon as my taxi conducir drove through the narrow, balcony-shaded laneways of Cartagena’s old walled town.  Charming, beautiful, cute, photogenic, insta-worthy?  Si Si Si!  Like a slightly bigger and busier version of Galle, a cleaner and shinier version of Zanzibar, this old Caribbean city is a photographer’s dream and oozing with beauty and charm. Back in the 1500s, Cartagena was an important port for the Spanish Empire for exporting riches from South America back to Europe.  Like Zanzibar, it was also a trading post for slaves from Africa.  Today, Cartagena is a popular vacation destination for Colombians and international visitors alike.  The streets in the…