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A visit to Peles Castle in Romania, which was built in a medieval style in 1914 but is filled with modern technological innovations, including its own hydro-electric power plant.
Behind the scenes of the ChÔteau de Fontainebleau in France, which began life as a medieval castle in the 12th century before being turned into a renaissance palace in the 1500s.
The Royal Palace of Stockholm, constructed on the site of a former castle called Tre Kronor, has been the official residence of the monarchy for over 250 years.