The colonial town of Mompox is another of Colombia's gems. It's pretty hard to get to, though one is richly rewarded if you do visit.
This colonial town has been the setting of numerous Colombian soap operas. If you've time on your trip to Colombia, it's well worth a visit to the delightful Mompos. See the section on colonial towns of Colombia for some further travel ideas.
Colonial archicture in South America.
Time stands still in Mompox, a wonderfully peaceful place to visit.