Surrounded by a classic crenellated wall, Óbidos gorgeous historic centre is a labyrinth of cobblestoned streets and flower - bedecked, whitewashed houses livened up with dashes of vivid yellow and blue paint. It’s a delightful place to pass an afternoon, but there are plenty of reasons to stay overnight, as there's excellent accommodation including a hilltop castle now converted into one of Portugal’s most luxurious pousadas (upmarket inns).