Cartagena

Cartagena (Colombia) needs 3 days: the walled colonial city (a UNESCO World Heritage Site) on one, and the nearby Rosario Islands for the rest. December-April is the dry season, with less humid heat than the rest of the year. It's among Colombia's most expensive cities for tourists, reflecting its international fame. Its walled city, with over 400 years of history and colorful colonial houses, was one of the Spanish empire's most important ports in the Americas and is today Colombia's most visited tourist destination.