In honor of World Environment Day, held each year on June 5, Business Insider is taking another look at the most irreplaceable sites on earth, identified in a study published in Science last year.
Business Insider: The most irreplaceable sites on Earth
The flat-topped mountains of Canaima National Park in southeastern Venezuela are among the world's most ancient rock formations and were the inspiration for Sir Arthur Conan Doyle's adventure novel \"The Lost World.
