Colombia and coffee 2
Here is another tip on Cartagena.
The ancient entrance to the walled city since the Colony is called the Torre del Reloj (The Clock Tower) which leads to a wide open space named Plaza de la Aduana (Customs Plaza. Keep in mind that in the colonies, there is nothing more important that ruling and collecting taxes on everything.
Source: http://www.roaste.com/CoffeeBlogs/Gazy/Colombia-and-coffee-2