Each guide covers when to go, what is worth booking ahead, the main sights and whether a car makes sense. Fares and ticket prices are shown only on the suppliers' sites, never invented here.
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Paris
Spring and autumn are the sweet spots; book the Eiffel Tower and the Louvre ahead.
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April, May and October are ideal; Colosseum tickets are issued in your name.
Read the guideBarcelona
May, June and late September are pleasant; Gaudí sights need timed tickets.
Read the guide