Why Louvre’s Mona Lisa keeps a smile: Paris’ cooling system

Japan Today | Aug 4, 2022 at 10:30 PM
  • The Mona Lisa may maintain her famously enigmatic smile because she benefits from one of Paris’ best-kept secrets: An underground cooling system that’s helped the Louvre cope with the sweltering heat that has broken temperature records across Europe.
  • The little-known “urban cold” network snakes unsuspecting beneath Parisians’ feet at a depth of up to 30 meters (98 feet), pumping out icy water through 89 kilometers (55 miles) of labyrinthine pipes.
  • It’s unclear how much of the system will be operational by the time of the Paris Olympics in 2024, but it’s possible the systems will be used in several Olympic sites.