Used for water distribution, the Delaware Aqueduct in New York, USA is the longest tunnel in the world (as of 2010). Drilled through solid rock, it reaches a staggering 137 kilometres (85 miles) in length. More tunnel facts.

Human tapeworms can grow up to 22.9m.

The largest individual flower on Earth is from a plant called Rafflesia arnoldii. Its flowers reach up to 1 metre (3 feet) in diameter and weigh around 10kg.

AMAZING FACTS