It's in the heart of the old city - climb to the top of the tower for a beautiful view of the city and a fresh air, even in a hot day. We went up by the elevator (instead of climbing 243 steps), and then continuted up by foot (all in al - 368 steps). Do it. I'm sure my son (16.5 y/o) would have loved to do it. Another benefit: it's a short visit. We did it just before lunch.
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