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Pena Palace, Sintra, Portugal
Portugal's Palacio Nacional de Pena may be one of the world's most colorful castles, with walls and turrets decked out in vibrant shades of yellow and red. The Bavarian-style palace dates back to 1840, when Ferdinand of Saxe Coburg-Gotha (the husband of Queen Maria II) commissioned a Prussian architect to design a royal residence on this dramatic hilltop site. Visitors can walk or take a carriage up to the palace from the park below.