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Portugal has seen a large rise in tourism numbers over the last five years. It has long summers, plenty of historical sites and is one of the cheapest countries in Europe. But the swelling number of visitors has created problems of its own, including rising housing prices. Are there now too many tourists, especially in the capital Lisbon? We sent our reporter Benjie Guy to find out. (Image: A line of tourists wait to buy tickets to São Jorge Castle, a Moorish fortress in Lisbon, Portugal. Credit: Getty Images)