The Walled City, which is the main city of Cartagena (the old town) before the urban sprawl, this city was built more than 4000 years ago by the tribes of Puerto Horjima. The city is surrounded by a huge wall around it, which was previously used to protect the city during wars. In 1984, the city and castle of Cartagena, with its colonial walls, was classified on the World Heritage List. It is the favorite of many visitors, as the houses have a distinctive architectural character. It has a lot of shops and restaurants, and you can hear music everywhere.