 Greece's culture ministry has ordered the closure of the Acropolis, the country's biggest cultural attraction, for several hours in the middle of a day, while authorities warn of extreme heat as southern Europe swelters in sizzling temperatures. British tourist Jordan Liddy says 10 minutes in the sun was enough for him. We were standing in the sun for over like 10 minutes. Even after 10 minutes, I'm feeling the heat. While Daisy Hatzis from Chicago missed the opening hours of the site.