Edward Grieg: Piano Concerto Op. 16; Sergei Rachmaninov: Piano Concerto No. 2 Op. 18

Mystery Files tries to unlock the secrets behind some of the most incredible stories in history-from lost ancient cities and vanishing ships to unbelievable scientific phenomena.

The natural world is home to some of the world's greatest mysteries. Read about such strange examples as insect-eating plants, blood-drinking animals, animals that swarm, living fossils, electrifying fish, and dung-eating insects.