Borders opened up across Europe on Monday after three months of coronavirus closures that began chaotically in March. But many restrictions persist, it’s unclear how keen Europeans will be to travel this summer and the continent is still closed to Americans, Asians and other international tourists. Border checks for most Europeans were dropped overnight in Germany, France and elsewhere, nearly two weeks after Italy opened its frontiers. The European Union’s 27 nations, as well as those in the Schengen passport-free travel area, which also includes a few non-EU nations such as Switzerland, aren’t expected to start opening to visitors from outside the continent until at least the beginning of next month, and possibly later. Announcing Monday’s reopening of borders and Paris restaurants, French President Emmanuel Macron said it’s time “to turn the page of the first act of the crisis” and “rediscover our taste for freedom.” […]