The Crossword Mural is found on a building in Lvov. This urban project has a special twist in that to play, you have to find the crossword’s questions in various locations around the city. In order to check that you have the correct answer, you have to come back during the night to check the answers, which are illuminated on the side of the building.

The concept behind this innovative idea takes the increasing popularity in all things puzzle and old-fashioned, stretching the traditional crossword to new heights--literally.