The reason I'm not adding the gold museum to the list is because everybody is going to tell you to go there, and you should... But please give Museo National a try! Once a prisson, this building is now full with colonial art. It holds the most extensive collection of the Hispanic paintings in Colombia. Walking the cells now fulfilled with art makes you think about what happened there before. Don't forget to go to the restaurant, they serve local food with a modern twist, highly recommended.