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The first thing I thought after reading arrive in Madrid on the 20th and start walking on the 21st was this is not a very smart idea. It is a very long and for almost all a tough day of walking. I couldn't agree more with @dick bird.
After...
I assume you are asking which one, because any of these places would require a day if not two to itself to appreciate on the most superficial level. Looking at your itinerary, I have to say you are trying to crowd in much too much in such a...
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