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Though it's been extensively restored, pieces of the original Roman Wall survive, and it's possible to walk almost the entire way around the city's old town on it, providing fantastic views of both the town and the wooded hills of Catalunya's mostly ignored interior. Also, it's free to get up there but some of the entry points aren't always easy to find. The best place to start your tour of the walls is in front of the Eglisa de San. Felix (St. Felix Church), walking to it's left (as you look at it) and following the street uphill until you reach some gardens. Through these gardens are stairways leading up several levels and finally to the walls themselves. It really is glorious from the top and even in the height of summer, you'll be one of the few people up there.
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