Tlacotalpan is a UNESCO World Heritage site. It's a colonial town from the 19th century, well preserved and renovated. The colour palette of the buildings is magnificent, and as a bonus, there are no electric wires or poles in many streets of the town.
The town was founded in 1820, and it has not changed since then. In 2010, a huge inundation flooded 500 historic buildings and forced the evacuation of 8,500 people. Since then, the town was renovated and the marks of this sad event have now completely disappeared.