Heat waves in Europe are becoming more dangerous. Here’s what this means for travelers

Growing up in Texas, Mary Beth Walsh thought she was used to high temperatures. Her hometown of Dallas, which is currently plagued by incessant heat, regularly suffers from 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 about how I have such a high heat tolerance; I take my sweatshirt to class in August (in the US)," she said.

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