An artist called Christo will be opening a big art project on Lake Iseo, in northern Italy, made from 220,000 plastic floating cubes.
Half a million people will get the chance to ‘walk on water’.
The cubes will make a 3.5km long path across the lake, and will be covered in a special yellow fabric which changes colour in the light.
The project is called ‘The Floating Piers’ and the the artist said it should feel like people are “walking on the back of a whale”.
When it officially opens, 150 volunteers and lifeguards will help out along the bridge to make sure everyone stays safe.