Heat waves in Europe are becoming increasingly dangerous. Here’s what that means for travelers

Growing up in Texas, Mary Beth Walsh thought she was used to high temperatures. Her hometown of Dallas, currently in the throes of a persistent heatwave, experiences frequent heat waves.

But when the 21-year-old visited Athens with her friends in mid-June, she was shocked by the "unbearable" 98 Fahrenheit (37 Celsius) heat she faced. "I actually had no idea how much heat was there until we got there, which was quite surprising," she told CNN.

"I always joke that I have such a high heat tolerance; I will take my sweatshirt to class in August (in the US)," she said.

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