The trip to Colombia - Cartagena at night

I would say that colonial cities render most their mystique at nighttime with their lamps reflecting on cobblestones on an empty street.

But in crowded touristic spots you might find it complicated cuz you´ll have people wondering around till very ungodly hours.

My recommendation is to get up early one day to catch the sunset and do an hour or two of nighttime pics with your tripod.