London
Best time: May–Sep
Royal parks, world-class free museums and a theatre scene that runs every night of the week.
Barcelona, Spain
Gaudí architecture, city beaches and tapas bars that open long after midnight.
May–Jun, SepBest time to visit
BCNCity code for flights
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More places nearby
Paris
Best time: Apr–Jun, Sep–Oct
Café terraces, the Seine at dusk and enough galleries to fill a month of afternoons.
Rome
Best time: Apr–Jun, Sep–Oct
Ancient ruins on every corner, piazzas built for lingering and pasta worth the flight.