The Blue Window is a natural stone slab on the island of Gozo, Malta, formed by fierce waves that washed limestone for thousands of years. On both sides are stone piers about 100 meters in diameter, supporting a stone cover, forming a "window" about 100 meters high and about 20 meters wide, from which you can see the blue waves of the Mediterranean opposite. Unfortunately, it fell more than two years ago, and the taxi driver took us to see the most blue window-like attractions to make up for our regrets.