As a heat wave grips Europe, lingering high temperatures expose the vulnerability of buildings and infrastructure.
Roads in Germany buckled. Trains were canceled in France. People are grappling with how to cool down the buildings that were designed to trap heat in cooler climates.
Meanwhile, large portions of the United States are set to experience their own heat wave with triple-digit temperatures over the July 4 holiday weekend. Can its infrastructure withstand this extreme heat?
