Rooms were booked years ago, and officials have been making plans. But there’s no telling where, exactly, Icelanders might go to find the best possible view.

© Amelia Nierenberg/The New York Times

Red high-temperature warnings remained in effect for much of southern and western Italy through Saturday.

© Tiziana Fabi/Agence France-Presse — Getty Images

Red high-temperature warnings remained in effect for much of southern and western Italy through Saturday.