Summer’s here. Travel, for many of us, is not just wonderful but essential | Jill Filipovic

Agnes Callard has her view - but we'd be better off if more people were willing to experience new places with open minds

The peak summer travel months are upon us, and that means millions of people the world over are packing a bag and setting off to somewhere else - maybe a familiar every-summer destination, maybe on a new adventure. This summer travel season is projected to be among the busiest on record.

But why travel at all?