Crossword Puzzle House

The world’s largest crossword puzzle may just be in Lviv, Ukraine. This crossword puzzle, which covers the side of a residential building is about 30 meters tall. During the day the crossword puzzle looks empty, but at night the letters light up to reveal the words. The questions for the puzzle are located in different points of interests of the city: monuments, theatres, fountains etc… So people walking around the city can try to solve the puzzle and write down their answers and when night comes they meet at the puzzle to see how they did.